--- product_id: 334346441 title: "Blackt Electrotech(BT35F): Updated Smoke Detection Sensor Alarm DIY 2 PC Pack" brand: "blackt electrotech" price: "£17.12" currency: GBP in_stock: true reviews_count: 8 category: "Blackt Electrotech" url: https://www.desertcart.co.uk/products/334346441-blackt-electrotech-bt35f-updated-smoke-detection-sensor-alarm-diy-2 store_origin: GB region: United Kingdom --- # Wireless Optical Sensor 85 dB Loud Alarm 1+ Year Battery Life Blackt Electrotech(BT35F): Updated Smoke Detection Sensor Alarm DIY 2 PC Pack **Brand:** blackt electrotech **Price:** £17.12 **Availability:** ✅ In Stock ## Summary > 🔥 Stay ahead of danger with silent tech that screams safety! 🔥 ## Quick Answers - **What is this?** Blackt Electrotech(BT35F): Updated Smoke Detection Sensor Alarm DIY 2 PC Pack by blackt electrotech - **How much does it cost?** £17.12 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/334346441-blackt-electrotech-bt35f-updated-smoke-detection-sensor-alarm-diy-2) ## Best For - blackt electrotech enthusiasts ## Why This Product - Trusted blackt electrotech brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Powerful 85 dB Alarm:** Loud enough to alert your entire home or office, ensuring safety first. - • **Humidity-Resistant Design:** Reliable performance even in high humidity environments up to 95%. - • **Long-lasting Battery Life:** Over a year of continuous protection with a simple 9V battery. - • **Smart Fault & Battery Alerts:** Audio-visual warnings keep you ahead of any sensor or power issues. - • **Instant Wireless Smoke Detection:** No wiring or assembly needed—plug & protect instantly. ## Overview The Blackt Electrotech BT35F is a sleek, wireless optical smoke detector pack featuring a piercing 85 dB alarm, over one year of battery life, and smart fault alerts. Designed for easy DIY installation with no wiring, it offers reliable smoke detection even in humid conditions, making it an essential safety upgrade for modern homes and offices. ## Description Product Description New Blackt Electrotech: Fire/Smoke Detection Sensor with Alert Alarm It can install and maintain easy for residential smoke alarms, It is cost effective expensive ways to provide warning early stage when a fire starts begin. It protect worming by loud alarm up to 85 dB prevent injuries and minimize property damage from Fire. When the chamber is filled with a certain density of smoke, it immediately raises an Alert, which helps to take necessary action regarding the Fire Break. Uses of Smoke Sensor are suitable for Offices, House, Hospitals, Hotels, etc. Choose a suitable area & drill to holes ceiling or wall as the bracket site. Put bracket screws & stick the bracket, Plug Put 9 Volt DC battery inside the unit & fix the unit to the plate. Press Test button unit working normally or not After installed unit it will working the LED will flash one time a minute, when some burning modes are detected, It will give out ringing & loud Whistle until the are density in bal Operating Volt: 9 Volt (not included) Battery or DC 12V (Network type) Static Current: less than 10 uA Alarm Current: less than 20-25 uA Sound Level: upto 85dB alarm signal. Operating Temp: -10 ~ +50 Deg C Opering Ilumidity:less than 95% RII Detecting Area: 25 Sq Mtr Easy to use & Installation. Loud Alarm up to 85dB alarm signal. Flashing LED indication. Color: White Test button for easy recommended monthly testing. It can install Ceiling or wall Low battery warning Review: good one - good product Review: Mediocre sensitivity but functional - The smoke alarm works but its sensitivity is not very good. It will go off only after the room is full of smoke. Alarm volume is good. The mounting plate is not very robust. 3.5 stars. However, you definitely need a smoke alarm in your kitchen and one in your child's room. ## Features - Faster/Safer Delivery : Continuous Monitoring system, Alarm Unit with 85 dB Alarm Signal - Optical Wireless smoke detector/Sensor/ Fault Signal warning (by Audio & visual) / No need any assembly or wiring - Discharged battery indicator/ Test Button/ 9 Volt Battery can use. (Battery Life more than year*) - Low Power consumption processing/ Special Anti- Humidity More Customer Care : Whapp/Mb: 9657707702 ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0946XVYM2 | | Alarm | Yes | | Best Sellers Rank | #5,449 in Home Improvement ( See Top 100 in Home Improvement ) #18 in Fire Safety | | Brand | Blackt Electrotech | | Colour | White | | Country of Origin | China | | Customer Reviews | 3.7 out of 5 stars 121 Reviews | | Item Weight | 240 Grams | | Manufacturer | Blackt Electrotech | | Number of Items | 2 | | Operating Humidity | 95 percent | | Power Source | Battery Powered | | Product Style | Alarm | | Sensor Type | optical | | Style | Alarm | | Unit Count | 2.0 Count | | Upper Temperature Range | 50 Degrees Celsius | ## Product Details - **Brand:** Blackt Electrotech - **Style:** Alarm - **Power Source:** Battery Powered - **Colour:** White - **Item Weight:** 240 Grams - **Alarm:** Yes - **Operating Humidity:** 95 percent - **Upper Temperature Rating:** 50 Degrees Celsius - **Sensor Type:** optical - **Number of Items:** 2 ## Images ![Blackt Electrotech(BT35F): Updated Smoke Detection Sensor Alarm DIY 2 PC Pack - Image 1](https://m.media-amazon.com/images/I/71CYglJD-SL.jpg) ![Blackt Electrotech(BT35F): Updated Smoke Detection Sensor Alarm DIY 2 PC Pack - Image 2](https://m.media-amazon.com/images/I/61VAjDa1Z5L.jpg) ![Blackt Electrotech(BT35F): Updated Smoke Detection Sensor Alarm DIY 2 PC Pack - Image 3](https://m.media-amazon.com/images/I/61YmXqI+IbL.jpg) ![Blackt Electrotech(BT35F): Updated Smoke Detection Sensor Alarm DIY 2 PC Pack - Image 4](https://m.media-amazon.com/images/I/61EJqNuIq8L.jpg) ![Blackt Electrotech(BT35F): Updated Smoke Detection Sensor Alarm DIY 2 PC Pack - Image 5](https://m.media-amazon.com/images/I/71FM4peV8XL.jpg) ## Questions & Answers **Q: Which type of sensor is used here- Photoelectric or Ionization?** A: Ionization ## Customer Reviews ### ⭐⭐⭐⭐⭐ good one *by M***D on 14 January 2026* good product ### ⭐⭐⭐⭐ Mediocre sensitivity but functional *by G***V on 6 January 2026* The smoke alarm works but its sensitivity is not very good. It will go off only after the room is full of smoke. Alarm volume is good. The mounting plate is not very robust. 3.5 stars. However, you definitely need a smoke alarm in your kitchen and one in your child's room. ### ⭐ 1 month life *by P***N on 5 February 2024* It stops working within 1 month. don’t buy. as a safety product it should work long but the quality is very poor. imagine you placed the device where you are fully relying on the device but it didn’t worked when needed. ## Frequently Bought Together - Blackt Electrotech(BT35F): Updated Smoke Detection Sensor Alarm DIY 2 PC Pack - Blackt Electrotech BT35 DIY Smoke Detection Sensor System with Alarm 85 dB Easy Installation and Maintenance Free for Small Family, Hotel, and Apartment (White) - Fire Stop Car and Home Fire Extinguisher (Pack of 2) --- ## 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/334346441-blackt-electrotech-bt35f-updated-smoke-detection-sensor-alarm-diy-2](https://www.desertcart.co.uk/products/334346441-blackt-electrotech-bt35f-updated-smoke-detection-sensor-alarm-diy-2) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-05-23*