---
product_id: 544175754
title: "TUNAI Firefly Bluetooth Receiver: World’s Smallest Wireless Audio Bluetooth 5.0 Adapter with 3.5mm AUX for Car/Home Stereo Music Streaming; Auto On, No Charging Needed - Car Kit (Grey)"
brand: "tunai"
price: "£0.75"
currency: GBP
in_stock: false
reviews_count: 13
url: https://www.desertcart.co.uk/products/544175754-tunai-firefly-bluetooth-receiver-world-s-smallest-wireless-audio-bluetooth
store_origin: GB
region: United Kingdom
---

# Auto On Compact Design Bluetooth 5.0 TUNAI Firefly Bluetooth Receiver: World’s Smallest Wireless Audio Bluetooth 5.0 Adapter with 3.5mm AUX for Car/Home Stereo Music Streaming; Auto On, No Charging Needed - Car Kit (Grey)

**Brand:** tunai
**Price:** £0.75
**Availability:** ❌ Out of Stock

## Summary

> 🎉 Elevate Your Sound Game with Firefly!

## Quick Answers

- **What is this?** TUNAI Firefly Bluetooth Receiver: World’s Smallest Wireless Audio Bluetooth 5.0 Adapter with 3.5mm AUX for Car/Home Stereo Music Streaming; Auto On, No Charging Needed - Car Kit (Grey) by tunai
- **How much does it cost?** £0.75 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/544175754-tunai-firefly-bluetooth-receiver-world-s-smallest-wireless-audio-bluetooth)

## Best For

- tunai enthusiasts

## Why This Product

- Trusted tunai brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **No Charging Needed:** Power on automatically with your engine or speaker activation.
- • **Space-Saving Design:** Sleek and compact, perfect for any car or home setup.
- • **Noise-Free Listening:** Built-in ground loop isolator eliminates unwanted noise for pure sound.
- • **Seamless Connectivity:** Enjoy instant reconnection without the hassle of manual pairing.
- • **Transform Your Audio Experience:** Easily convert any stereo system into a Bluetooth powerhouse.

## Overview

The TUNAI Firefly Bluetooth Receiver is the world's smallest wireless audio adapter, designed to effortlessly transform your car and home stereo systems into Bluetooth-enabled speakers. With Bluetooth 5.0 technology, it offers seamless auto-reconnection, a built-in ground loop isolator for noise-free listening, and a compact design that fits perfectly in any space. Plus, it powers on automatically, eliminating the need for charging.

## Description

Product description Demand Exceptional Sound Quality! Revolutionize your home and car audio systems with FIREFLY, the world's smallest Bluetooth music receiver. Experience crystal-clear, high-quality music streaming from your smartphone or tablet with our patented technology supporting multiple codecs, including AAC. Designed to elevate the audio experience, FIREFLY is the ultimate accessory for iOS and Android enthusiasts. While most Bluetooth receivers settle for subpar SBC codecs, FIREFLY stands out by incorporating AAC and MP3 codecs through our patented Sound Revitalization Technology. This ensures superior sound quality, especially for music streaming. Unlock the full potential of your speakers and car audio systems with FIREFLY, a must-have for iPhone and iPad users seeking optimal performance over Bluetooth. Don't settle for less when it comes to sound quality. Effortless Connection, Seamless Pairing! Plug FIREFLY into your audio system and USB power source for quick setup. Pairing with your smart device is a breeze via the Bluetooth Settings. The LED light, resembling a FIREFLY, keeps you informed about the connection status at all times. Enjoy hassle-free connectivity with FIREFLY. Smart Auto-Connection, Enhanced Convenience! FIREFLY recalls up to 2 paired devices. The moment you start your engine or power up your home audio system, it seamlessly auto-connects to the last used device. Embrace a hassle-free and efficient audio experience with FIREFLY. Unleash Non-Stop Connectivity! Say goodbye to the inconvenience of charging your Bluetooth receiver. Unlike many others, FIREFLY powers up instantly when you start your engine or home audio system. It conveniently powers up through the USB port while playing, eliminating the need for separate charging. Enjoy uninterrupted connectivity with FIREFLY. Ground Loop Noise Solved! Experience the TUNAI FIREFLY's breakthrough built-in ground loop isolator chip. Bid farewell to high-pitched whine, alternator noise, and bothersome hissing caused by your car's electrical system. No need for an additional ground loop isolator. Activate it effortlessly using the included pin. Say goodbye to noise and hello to pristine audio with the TUNAI FIREFLY. Warning In some car electrical designs, using a ground loop isolator may cause no sound output. Please contact TUNAI for help. Seamless Wireless Audio Solutions for Aux-in Ports! Elevate your car Operation range : 10m / 33ftor wired home stereo with instant Bluetooth capabilities. Firefly effortlessly transforms your system, offering wide compatibility with most car and home stereo setups. What's Included? - FIREFLY Bluetooth Receiver x 1 - 3.5mm AUX extension cord (60cm / 23.6") x 1 - User manual x 1 Key Spec Bluetooth 5.0 Profile support : A2DP Audio codec support : SBC, AAC Operation Range – 10m / 33ft Input Voltage – DC 5V Cable material : Pure Copper + Gold plated connector Dimension: 1.4cm x 4.2cm x 0.6cm; Weight: 10g How can I improve the sound quality if it seems distorted (muddy or staticy), especially on loud bass? Turn down the volume on your phone, and up on the car stereo. This should improve the sound. I hear a noise when no music is playing, like a whine or hum. Is there a solution? This is caused by a ground loop in the car’s electrical system. Please contact TUNAI for help, or use a ground loop isolator to suppress the sound. Does the product require a power source? Yes, the product requires power. Please use your car’s USB port to provide DC 5V. If your car does not have a USB port for power, you will need to prepare a car charger or similar device to supply power. Sometimes the Firefly doesn’t reconnect to the phone. What can I do? ‘Forget’ all devices from your phone’s Bluetooth menu, restart the phone, and pair with the Firefly again. If you’re still having trouble, please contact TUNAI. The USB port doesn’t seem able to power the Firefly. Is there a solution? The Firefly takes very little power (~20mW), causing some car USB ports to be unable to detect the Firefly and shut off power. Select models of Mini Cooper and BMW are known to have this issue. Switching to a USB cigarette adapter will solve the problem. Can I take calls with Firefly? No. If you need to take calls, please check out the Firefly Chat.

Review: Brilliant! Small unobrusive device adds bluetooth music to your car with bluetooth phone. - Usage: Add Bluetooth *MUSIC* to my car stereo., but *NOT* phone I have a 2006 BMW 325i sedan, in great shape inside and out and mechanically. . .but. . .it only supports Bluetooth phone, not Bluetooth music. The Bluetooth phone works fine in the car, so I specifically looked for a BT receiver that did *NOT* have a mic, I want to use the car buluetooth for phone. The reason I chose this specific BT receiver over the many others in the market place, is it's foot print. You just plug one end into USB power, and the other end into your aux input. EZ and unobtrusive!. If your aux input and USB power are not that close together, it comes with a very nice quality aux audio extension cord, even with the base model. With the BMW, the aux input and the power supply are both inside the armrest console, and less than 1 inch apart. So I just needed the simple little 3 inch cable, it works brilliantly inside the console, and nobody even knows it's there. Any passenger would think the phone is streaming directly with the stereo, and would never know this extra device exists. It does have a cool light when it's active, so if it was visible in your vehicle, it's kind of cool, and definitely not bulky or huge eye sore. It was easy to pair with my phone, and it streams music nicely until you get a phone call. At which time the bluetooth transfers smoothly to the car bluetooth. NICE!!!
Review: This Product Delivers - Super strong stable Bluetooth connection. Turns on automatically and connects every time. Sound quality is terrific, I couldn't be happier. Five Stars and a hearty recommendation. *UPDATE* I purchased this product in July. While I stand by my initial review, there is something I should add, as potential buyers definitely need to be aware of this. This product is very sensitive to the cold. If you park outdoors, be aware that when the temp gets down to about the 30° range, the firefly will connect, but not send out any audio until it (and your car) warms up a bit. Sometimes can take a few minutes, depending on how long it takes your car to warm up. Not a deal breaker for me personally, overall I am still very satisfied by the ease and reliability of this product. But for folks who want to just get in their car, turn on the music and go, this could be a problem in the winter time.

## Features

- Wireless Transformation Made Easy : Turn your home stereo and car audio systems into Bluetooth-enabled speakers with a simple plug. No charging required! FIREFLY powers on automatically with your engine or speaker activation.
- Seamless Auto-Reconnection : Say farewell to manual pairing. FIREFLY instantly connects when Bluetooth is activated, automatically linking to the last device used.
- Silence Ground Loop Noise : FIREFLY comes with a built-in ground loop isolator, ensuring no more hissing or humming sounds. Active this feature through the pin included for uninterrupted music enjoyment.
- Sleek and Compact : Maintain a stylish and space-saving audio setup with FIREFLY's convenient compact design. (USB charger not included)

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0BYSSCQKT |
| Additional Features | World’s Smallest Wireless Audio, Built-in Ground Loop Isolator |
| Audio Input | 3.5 mm audio jack |
| Audio Output Mode | Stereo |
| Audio Output Type | auxiliary |
| Best Sellers Rank | #149 in Bluetooth Car Kits |
| Bluetooth support? | Yes |
| Brand | TUNAI |
| Color | Grey |
| Compatibility Options | Bluetooth A2DP-enabled devices |
| Compatible Devices | Bluetooth A2DP-enabled devices |
| Connectivity Technology | 3.5 mm AUX |
| Connector Type Used on Cable | Auxiliary |
| Control Method | Touch |
| Customer Reviews | 4.2 out of 5 stars 1,290 Reviews |
| Hardware Interface | Bluetooth |
| Includes Remote | No |
| Installation Type | Plug In |
| Item Dimensions L x W x H | 6.3"L x 0.5"W x 0.2"H |
| Item Weight | 0.06 Kilograms |
| Manufacturer | TUNAI |
| Model Name | HULK-03 |
| Number of Channels | 2 |
| Power Source | Corded Electric |
| Product Dimensions | 6.3"L x 0.5"W x 0.2"H |
| Rechargeable Battery Included | No |
| Special Feature | World’s Smallest Wireless Audio, Built-in Ground Loop Isolator |
| Supported Application | Bluetooth A2DP |
| Supported Media Type | MP3 |
| Supported Standards | Bluetooth A2DP |
| Voltage | 5 Volts (DC) |
| Warranty Description | 1 Year Warranty |
| Wireless Compability | Bluetooth |

## Product Details

- **Special Feature:** World’s Smallest Wireless Audio, Built-in Ground Loop Isolator
- **Brand:** TUNAI
- **Connectivity Technology:** 3.5 mm AUX
- **Power Source:** Corded Electric
- **Product Dimensions:** 6.3"L x 0.5"W x 0.2"H

## Images

![TUNAI Firefly Bluetooth Receiver: World’s Smallest Wireless Audio Bluetooth 5.0 Adapter with 3.5mm AUX for Car/Home Stereo Music Streaming; Auto On, No Charging Needed - Car Kit (Grey) - Image 1](https://m.media-amazon.com/images/I/51vz6NIqcVL.jpg)
![TUNAI Firefly Bluetooth Receiver: World’s Smallest Wireless Audio Bluetooth 5.0 Adapter with 3.5mm AUX for Car/Home Stereo Music Streaming; Auto On, No Charging Needed - Car Kit (Grey) - Image 2](https://m.media-amazon.com/images/I/71VPak1-BZL.jpg)
![TUNAI Firefly Bluetooth Receiver: World’s Smallest Wireless Audio Bluetooth 5.0 Adapter with 3.5mm AUX for Car/Home Stereo Music Streaming; Auto On, No Charging Needed - Car Kit (Grey) - Image 3](https://m.media-amazon.com/images/I/61S3-k1brxL.jpg)
![TUNAI Firefly Bluetooth Receiver: World’s Smallest Wireless Audio Bluetooth 5.0 Adapter with 3.5mm AUX for Car/Home Stereo Music Streaming; Auto On, No Charging Needed - Car Kit (Grey) - Image 4](https://m.media-amazon.com/images/I/61v1QYZrxEL.jpg)
![TUNAI Firefly Bluetooth Receiver: World’s Smallest Wireless Audio Bluetooth 5.0 Adapter with 3.5mm AUX for Car/Home Stereo Music Streaming; Auto On, No Charging Needed - Car Kit (Grey) - Image 5](https://m.media-amazon.com/images/I/710SHrtETPL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Brilliant! Small unobrusive device adds bluetooth music to your car with bluetooth phone.
*by D***W on July 10, 2018*

Usage: Add Bluetooth *MUSIC* to my car stereo., but *NOT* phone I have a 2006 BMW 325i sedan, in great shape inside and out and mechanically. . .but. . .it only supports Bluetooth phone, not Bluetooth music. The Bluetooth phone works fine in the car, so I specifically looked for a BT receiver that did *NOT* have a mic, I want to use the car buluetooth for phone. The reason I chose this specific BT receiver over the many others in the market place, is it's foot print. You just plug one end into USB power, and the other end into your aux input. EZ and unobtrusive!. If your aux input and USB power are not that close together, it comes with a very nice quality aux audio extension cord, even with the base model. With the BMW, the aux input and the power supply are both inside the armrest console, and less than 1 inch apart. So I just needed the simple little 3 inch cable, it works brilliantly inside the console, and nobody even knows it's there. Any passenger would think the phone is streaming directly with the stereo, and would never know this extra device exists. It does have a cool light when it's active, so if it was visible in your vehicle, it's kind of cool, and definitely not bulky or huge eye sore. It was easy to pair with my phone, and it streams music nicely until you get a phone call. At which time the bluetooth transfers smoothly to the car bluetooth. NICE!!!

### ⭐⭐⭐⭐⭐ This Product Delivers
*by J***A on July 29, 2020*

Super strong stable Bluetooth connection. Turns on automatically and connects every time. Sound quality is terrific, I couldn't be happier. Five Stars and a hearty recommendation. *UPDATE* I purchased this product in July. While I stand by my initial review, there is something I should add, as potential buyers definitely need to be aware of this. This product is very sensitive to the cold. If you park outdoors, be aware that when the temp gets down to about the 30° range, the firefly will connect, but not send out any audio until it (and your car) warms up a bit. Sometimes can take a few minutes, depending on how long it takes your car to warm up. Not a deal breaker for me personally, overall I am still very satisfied by the ease and reliability of this product. But for folks who want to just get in their car, turn on the music and go, this could be a problem in the winter time.

### ⭐⭐⭐⭐ works as advertised, except for the auto-connect
*by T***L on September 23, 2019*

i have struggled with finding a connection either aux or usb to work in my 2012 cadillac (factory system only defaults to iOS, no android support for bluetooth or usb music) This fit the bill and works great. no ground loop /noise issues. sound quality is good and consistent. not great, but definitely good enough for in the car. the call function has worked flawlessly, even with the firefly located inside my center console. I have no issues with overheating like some people describe. The only reason i gave this 4 stars vs 5 is that the auto connect does not seem to function consistently. It successfully auto connects probably 1 out 10 times (very rarely) its easy enough to connect via "previously connected devices" but it is a little frustrating as I have other devices that connect to my phone 100% of the time. It is frustrating but not enough to return or stop using. I have NOT tried this on my home stereo in order to really test the sound quality. In short, I'd buy it again without hesitation. it cost ~$30 at the time of purchase which seemed kind of high, but it is less than what I spent on other devices trying to find a solution for my car

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*Product available on Desertcart United Kingdom*
*Store origin: GB*
*Last updated: 2026-07-05*