---
product_id: 745404396
title: "X-Sense Smart Mailbox Alarm, Wireless Long Range Mailbox Alert, Mailbox Sensor with SBS50 Base Station for Delivered Mail, SMA11"
brand: "x-sense"
price: "£4.68"
currency: GBP
in_stock: false
reviews_count: 5
url: https://www.desertcart.co.uk/products/745404396-x-sense-smart-mailbox-alarm-wireless-long-range-mailbox-alert
store_origin: GB
region: United Kingdom
---

# 2.4 GHz long-range wireless 4-year battery life IP65 waterproof durability X-Sense Smart Mailbox Alarm, Wireless Long Range Mailbox Alert, Mailbox Sensor with SBS50 Base Station for Delivered Mail, SMA11

**Brand:** x-sense
**Price:** £4.68
**Availability:** ❌ Out of Stock

## Summary

> 📬 Stay ahead of your mail game with smart alerts that keep you connected!

## Quick Answers

- **What is this?** X-Sense Smart Mailbox Alarm, Wireless Long Range Mailbox Alert, Mailbox Sensor with SBS50 Base Station for Delivered Mail, SMA11 by x-sense
- **How much does it cost?** £4.68 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/745404396-x-sense-smart-mailbox-alarm-wireless-long-range-mailbox-alert)

## Best For

- x-sense enthusiasts

## Why This Product

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

## Key Features

- • **Instant Mail Alerts:** Get real-time push notifications the moment your mail arrives—never miss a delivery again.
- • **All-Weather Reliability:** Built tough with IP65 waterproof rating and UV-resistant shell to withstand any climate.
- • **Effortless Wireless Setup:** 100% wire-free installation with included double-sided tape—set up in seconds, no tools required.
- • **Seamless Multi-User Sharing:** Share mailbox access with family or roommates effortlessly via the intuitive X-Sense app.
- • **Universal Mailbox Compatibility:** Sleek, compact design fits curbside, wall mount, slot, and cluster mailboxes for versatile use.

## Overview

The X-Sense Smart Mailbox Alarm (SMA11) is a wireless, long-range mailbox sensor that delivers instant push notifications via a 2.4 GHz Wi-Fi connection. Featuring a 4-year battery life, IP65 waterproof rating, and compatibility with multiple mailbox types, it offers easy, tool-free installation and multi-user sharing through the X-Sense app, ensuring you never miss a delivery regardless of weather or location.

## Description

Mailbox Alert, X-Sense Smart Mailbox Alarm, Wireless Long Range Mailbox Alert, Mailbox Sensor with SBS50 Base Station for Delivered Mail, SMA11

Review: Facile à installer et à mettre en ligne. - Très efficace
Review: Great for Parcel Letterbox - The X-Sense mailbox alarm SMA11 which includes the SBS50 base station and the SMA51 sensor works brilliantly. The sensor is small, relatively unobtrusive, and is built for outdoor use. It has an IP65 rating and UV‑resistant housing so it will stand up to rain and sun without looking bulky. The package includes a mounting bracket for the sensor and 2 pieces (1 spare) double‑sided tape for quick installation to your mailbox. The sensor detection combines an infrared sensor and a tilt/motion trigger. I have found that it gives fast, accurate alerts for my parcel letterbox and most likely for most mailbox types. The base station will sound an alarm of your choice from 7 preset alert tones on the base station and you'll get a push notification to your phone the moment the mail flap or mailbox is opened. Range will depend on placement of the SBS50 base station but X‑Sense advertises long‑range transmission suitable for typical suburban setups. The SMA51 sensor (that attaches to your letterbox door/mail flap/parcel door of the letterbox) uses a replaceable CR2 lithium battery and X‑Sense estimates that you'll get about four years of standby life based on approximately 5 triggers per day. Now I find that that excellent and makes for a very low‑maintenance sensor. The X-Sense home security app is fairly straightforward to use and it is from here that you can change alert tones and control the volume (up to 100 dB on the base station). You can share alerts with multiple other users/family members by adding in email addresses, they then get an invitation for which they will need to accept in order to share alerts. You can change device names and clear any alerts from the app or directly from the base station. Just be mindful that this device will not pair directly with your phone you will need the SBS50 base station unless you already have one or buy the kit. My installation is in an all steel bricked in parcel letterbox and the signal has no issue reaching the base station. I am extremely pleased with the operation of the X-Sense Mailbox Alarm so far. In my case I installed the sensor on the inside of the mail flap of the parcel letterbox and it works equally as good when I get mail or when I get a parcel.

## Features

- Real-Time Push Alerts & Multi-User Sharing: The moment your mail arrives, you'll receive an instant app push alert; manage various features from your phone, such as device sharing, mail reminder, one-button silence, adjusting volume up to 100 dB, and ringtone selection
- Long-Distance Transmission, Accurate Detection: With extensive coverage, the smart mailbox alarm maintains a strong and reliable connection to the base station via a 2.4 GHz Wi-Fi network, and promptly sends notifications to your phone
- Compatibility with Various Mailbox Types: This mailbox alarm is designed with a sleek and compact profile; compatible with curbside/post mount, wall mount, slot type, and cluster type mailboxes; not suitable for mail slots without lids
- Extra Long Standby, Easy Setup: The replaceable battery offers a long 4-year lifespan based on 5 daily triggers; the alarm is 100% wire-free and easy to install using the double-sided tape included; following the in-app instructions, simply add it to the X-Sense app in seconds
- Built for All-Weather Durability: With its IP65 waterproof rating and an operating temperature range of 14–140°F (-10–60°C), this wireless mailbox alarm operates reliably even in extreme weather; ASA shell and silicone seal prevent fading caused by sunlight and UV rays

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0CPLQ16K7 |
| Audible Noise | 100 Decibels |
| Battery Description | CR2 , AAA |
| Brand | X-Sense |
| Built-In Media | 1 X SBS50 Base Station, 1 X User Manual, 1 X Smart Mailbox Alarm SMA51 |
| Colour | Black |
| Compatible Devices | Smartphone |
| Control Method | App |
| Customer Reviews | 4.3 out of 5 stars 1,461 Reviews |
| Item Type Name | Smart Mailbox Alarm |
| Manufacturer | X-SENSE |
| Maximum Range | 50 metres |
| Mfr Part Number | X-SENSE |
| Model Number | SMA11 |
| Mounting Type | Post Mount |
| Number of Batteries | 1 CR2 batteries required. (included) |
| Power Source | Battery Powered |
| Sensor Technology | Contact Sensor |
| UPC | 850053675409 |
| Voltage | 3 Volts |
| Wattage | 1000 milliamp_hours |

## Product Details

- **Colour:** Black
- **Brand:** X-Sense
- **Number of Batteries:** 1 CR2 batteries required. (included)
- **Voltage:** 3 Volts
- **Maximum Range:** 50 metres

## Images

![X-Sense Smart Mailbox Alarm, Wireless Long Range Mailbox Alert, Mailbox Sensor with SBS50 Base Station for Delivered Mail, SMA11 - Image 1](https://m.media-amazon.com/images/I/61JsrJVrxqL.jpg)
![X-Sense Smart Mailbox Alarm, Wireless Long Range Mailbox Alert, Mailbox Sensor with SBS50 Base Station for Delivered Mail, SMA11 - Image 2](https://m.media-amazon.com/images/I/617W2EqMrnL.jpg)
![X-Sense Smart Mailbox Alarm, Wireless Long Range Mailbox Alert, Mailbox Sensor with SBS50 Base Station for Delivered Mail, SMA11 - Image 3](https://m.media-amazon.com/images/I/61BzIWlfsLL.jpg)
![X-Sense Smart Mailbox Alarm, Wireless Long Range Mailbox Alert, Mailbox Sensor with SBS50 Base Station for Delivered Mail, SMA11 - Image 4](https://m.media-amazon.com/images/I/61ARKm9QQxL.jpg)
![X-Sense Smart Mailbox Alarm, Wireless Long Range Mailbox Alert, Mailbox Sensor with SBS50 Base Station for Delivered Mail, SMA11 - Image 5](https://m.media-amazon.com/images/I/61hPCn-zjxL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Facile à installer et à mettre en ligne.
*by R***N on 18 January 2026*

Très efficace

### ⭐⭐⭐⭐⭐ Great for Parcel Letterbox
*by G***Z on 7 May 2026*

The X-Sense mailbox alarm SMA11 which includes the SBS50 base station and the SMA51 sensor works brilliantly. The sensor is small, relatively unobtrusive, and is built for outdoor use. It has an IP65 rating and UV‑resistant housing so it will stand up to rain and sun without looking bulky. The package includes a mounting bracket for the sensor and 2 pieces (1 spare) double‑sided tape for quick installation to your mailbox. The sensor detection combines an infrared sensor and a tilt/motion trigger. I have found that it gives fast, accurate alerts for my parcel letterbox and most likely for most mailbox types. The base station will sound an alarm of your choice from 7 preset alert tones on the base station and you'll get a push notification to your phone the moment the mail flap or mailbox is opened. Range will depend on placement of the SBS50 base station but X‑Sense advertises long‑range transmission suitable for typical suburban setups. The SMA51 sensor (that attaches to your letterbox door/mail flap/parcel door of the letterbox) uses a replaceable CR2 lithium battery and X‑Sense estimates that you'll get about four years of standby life based on approximately 5 triggers per day. Now I find that that excellent and makes for a very low‑maintenance sensor. The X-Sense home security app is fairly straightforward to use and it is from here that you can change alert tones and control the volume (up to 100 dB on the base station). You can share alerts with multiple other users/family members by adding in email addresses, they then get an invitation for which they will need to accept in order to share alerts. You can change device names and clear any alerts from the app or directly from the base station. Just be mindful that this device will not pair directly with your phone you will need the SBS50 base station unless you already have one or buy the kit. My installation is in an all steel bricked in parcel letterbox and the signal has no issue reaching the base station. I am extremely pleased with the operation of the X-Sense Mailbox Alarm so far. In my case I installed the sensor on the inside of the mail flap of the parcel letterbox and it works equally as good when I get mail or when I get a parcel.

### ⭐⭐⭐⭐⭐ Amazing Mailbox Alarm
*by A***Y on 23 October 2024*

I purchased this as a replacement and was blown away with how much superior this is to the old one I had. It does have the base station you need to setup, and I have this farther away from the mailbox than I ever have. The setup was simple, just install the app on your phone. Only took me a few minutes to get setup. The device for the mailbox is pretty flexible, there are different options for how to mount it depending on your mailbox setup. This works with a bunch of different types of mailboxes. Mine is a standard side of the road mailbox where the door flips down. This device is VERY sensitive and I've never missed an alert (again my old one wouldn't always register the door opened). You also have adjustments for the sensor to accommodate non-level ground or other anomalies in your installation. If I was critical about anything, it would be the instructions on mounting the sensor. There is an adjustment knob, which appears to allow you to adjust for uneven ground, but I couldn't find anything in the instructions. Luckily it wasn't an issue for me. Now some cool things.. the app gets a push notification from the base station when the mailbox is opened. The base station blinks red, you get an alert on your phone, and in the app you get a big red pop-up indicating the mailbox was opened. You have to press the little button on the back of the base station to turn off the alert. This means keep the base station handy. I really wish there was a way to reset it through the application. To be fair, there is an option in the app as to whether or not to flash red until you acknowledge it by pressing the button. The app is flexible, you can determine if you want an audible alarm, if you want it to sound once or until acknowledged. You can also change the sound it plays. 7 different options and multiple volume levels. Mine has barking dogs activated. As complete as this device is, I was a little annoyed that the sounds are labeled Tone 1, Tone 2, ... until Tone 7. You basically have to play each of them to figure out which one to use. You also have the option of what type of notifications. The device was triggered, when silenced, or if there is a low battery. Finally, the base station is the generic X-Sense base station, so it works with their other security products (door open, motion sensor, etc.) Bottom line, this is superior than any other mailbox alert system that I've had. The distance and reliability is awesome! I love that I get alerts on my mobile device. If you are in the market, I can't image how you could go wrong. Awesome device!!

## Frequently Bought Together

- X-Sense Smart Mailbox Alarm, Wireless Long Range Mailbox Alert, Mailbox Sensor with SBS50 Base Station for Delivered Mail, SMA11
- X-Sense Smart Mailbox Alarm, Requires SBS50 Base Station, Wireless Long Range Mailbox Alert, Mailbox Sensor for Delivered Mail, SMA51
- X-Sense Smart Home Security System, Wireless Home Alarm System 8-Piece Kit, Supports Mobile App Alerts, Compatible with Alexa, Includes 1 Base Station, 4 Door Sensors, 2 Motion Sensors, 1 Keypad, AS08

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.co.uk/products/745404396-x-sense-smart-mailbox-alarm-wireless-long-range-mailbox-alert](https://www.desertcart.co.uk/products/745404396-x-sense-smart-mailbox-alarm-wireless-long-range-mailbox-alert)

---

*Product available on Desertcart United Kingdom*
*Store origin: GB*
*Last updated: 2026-05-21*