1. What type of fire does this smoke detector identify?

It detects smoke generated by developing fires and triggers an 85dB alarm to provide early warning for safer evacuation.

2. How loud is the alarm?

The built-in siren produces an 85dB alarm, making it loud enough to alert occupants in nearby rooms during emergencies.

3. What area can one detector cover?

One unit provides effective smoke detection coverage for areas up to approximately 25 square meters under normal conditions.

4. Does it require wiring for installation?

No, it operates on a 9V battery (not included) and can be mounted easily on a ceiling or wall without wiring.

5. How do I know the detector is working?

The LED flashes once every minute in standby mode and flashes rapidly with the alarm when smoke is detected.

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Blackt Electrotech(BT35F): Updated Smoke Detection Sensor Alarm DIY 2 PC Pack

Blackt Electrotech(BT35F): Updated Smoke Detection Sensor Alarm DIY 2 PC Pack

Product ID: 334346441

Details

Brand
Blackt
Style
Alarm
Power Source
Battery
Colour
White
Item Weight
240 Grams
Alarm
Yes

💡LED status indicator

📏25m² coverage area

🔊85dB loud alarm

€ 25.81

Duties & taxes included

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Sold byAmazon GERMANYDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔥 Stay ahead of danger with Blackt Electrotech’s sharp smoke detection! 🚨

INSTANT FIRE ALERT - 85dB siren cuts through noise for immediate safety awareness
SMART LED VIGILANCE - Clear LED flashes to confirm continuous monitoring and quick smoke detection
COMPACT YET POWERFUL - Covers up to 25 square meters with sleek, space-saving design
ALL WEATHER RELIABILITY - Operates flawlessly from -10°C to 50°C and up to 95% humidity
EFFORTLESS DIY INSTALLATION - Battery-powered, no wiring needed—mount on ceiling or wall in minutes

The Blackt Electrotech BT35F Smoke Detection Sensor Alarm 2-pack delivers reliable, high-sensitivity smoke detection with an 85dB alarm and clear LED indicators. Designed for easy DIY installation without wiring, it covers up to 25 square meters and operates effectively in diverse indoor environments, ensuring continuous fire safety monitoring for homes, apartments, and public spaces.

Specifications

Alarm	Yes
Asin	B0946XVYM2
Best Sellers Rank	#13,721 in Home Improvement (See Top 100 in Home Improvement) #25 in Fire Safety
Brand	Blackt Electrotech
Colour	White
Country Of Origin	China
Customer Reviews	3.8 3.8 out of 5 stars (144) 3.8 out of 5 stars
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
Unit Count	2.0 Count
Upper Temperature Range	50 Degrees Celsius

Reviews

User

Value for money

I found this product very good and useful. I have even tested it by burning paper and it gave alarm very soon. I will recommend it

6.08.2026

User

Does its purpose

Does its purpose tested with smoke also working but battery should be included

5.07.2026

User

Works after burned down

Average Product bcz its working Very slow alarm After everything burned down

24.05.2026

User

Good

Good senser must provide cell ..

15.06.2026

User

1 month life

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.

5.02.2024

User

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.

6.01.2026

User

Good product

27.05.2026

User

good one

good product

14.01.2026

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€ 25.81

Duties & taxes included

In stock

Sold byAmazon GERMANYDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to GERMANY.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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