Blackt Electrotech (BT51D) 120dB 4in1 Wireless Door and Window Alarm Sensor for Home and Property Security
Details
- Colourwhite
- BrandBlackt
- Power SourceBattery
- Compatible DevicesHome Security
- Control MethodTouch
Description
🚨 Don’t wait for a break-in—secure your sanctuary now!
- EFFORTLESS SETUP - Peel, stick, and protect—no tools or hassle required
- VERSATILE SECURITY - Protect doors, windows, and more with one sleek sensor
- COMPACT LIGHTWEIGHT - Discreet 8x3x2 cm design fits anywhere without bulk
- INSTANT INTRUDER ALERT - 120dB alarm cuts through noise to secure your space
- TRUSTED BRAND RELIABILITY - Blackt Electrotech quality engineered for peace of mind
The Blackt Electrotech BT51D is a compact, wireless 4-in-1 door and window alarm sensor delivering a powerful 120dB alert. Designed for easy peel-and-stick installation, it offers versatile protection for multiple entry points, making it an essential upgrade for modern home security.
Specifications
| Noise Level | 120 dB |
| Mounting Type | Door Mount |
| Sensor Technology | Contact Sensor |
| Manufacturer | Blackt Electrotech |
| Country of Origin | China |
| Item model number | BT51D |
| Product Dimensions | 8 x 3 x 2 cm; 80 g |
| ASIN | B0DBJ2R2K4 |
Reviews
P**A
works as expected
I have kids who keep leaving the door open and we live on the ground floor, Don't want cats etc to come inside the house. This device keeps beeping till the door is closed. Very helpful
S**
Great product
Welcome tune is bit irritating, can be more soothing. Rest everything is best.
P**L
Nice
Nice
A**K
Bought two. One works fine. Another one stopping working within a month.
I bought two of them. One works fine. Another one stopped working within a month! Changing batteries or trying working batteries from the other unit didn't help. Could be a hit or miss...
P**.
Good quality and VERY loud, however
The first time I ordered, Amazon sent me a different product but the next time they sent the right one.The box is small and contains the main unit, the magnet and a few double sided tapes for installation.There are 4 modes is this as indicated in the video in the product description.However, the Chime mode doesn't sound as shown in the video. It doesn't really Chime but Beeps loudly two times. I had expected that the chime mode would be like as shown in the video, like doorbell sound.The product build quality is good. Let's see how long it works.
M**7
Great Door Alarm Sensor for home security
The media could not be loaded. The door alarm sensor is a reliable and easy-to-install security device that offers peace of mind with its loud alarm and motion detection. It effectively alerts you to any unauthorized entry, making it a great addition to home security systems.
N**L
Alarm sound- Gap between alarm / should be continuous
The media could not be loaded. Alarm is not continuous . After 3 beep there is a gap of few seconds. Somebody open the door/ break the door and close it the sound stops. Not worthy in terms of a security alarm.
S**I
Great for Basic Home Security
Good quality build, very loud alarm. Peel‑and‑stick installation took minutes. Four modes are handy and functional.
Common Questions
Trustpilot
5 days ago
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