---
product_id: 650226288
title: "Blackt Electrotech BT51A Wireless Motion Sensor Alarm with Intelligent Welcome Doorbell, Infrared Detector, Gate Alert Alarm, Remote Control, Easy Install for Daily Safety Protection"
brand: "blackt electrotech"
price: "€ 30.49"
currency: EUR
in_stock: true
reviews_count: 8
category: "Blackt Electrotech"
url: https://www.desertcart.hr/products/650226288-blackt-electrotech-bt51a-wireless-motion-sensor-alarm-with-intelligent-welcome
store_origin: HR
region: Croatia
---

# 8m Infrared detection range 2-in-1 security & welcome modes 110dB adjustable alarm volume Blackt Electrotech BT51A Wireless Motion Sensor Alarm with Intelligent Welcome Doorbell, Infrared Detector, Gate Alert Alarm, Remote Control, Easy Install for Daily Safety Protection

**Brand:** blackt electrotech
**Price:** € 30.49
**Availability:** ✅ In Stock

## Summary

> 🚨 Stay ahead of every step with BT51A — where security meets smart welcome!

## Quick Answers

- **What is this?** Blackt Electrotech BT51A Wireless Motion Sensor Alarm with Intelligent Welcome Doorbell, Infrared Detector, Gate Alert Alarm, Remote Control, Easy Install for Daily Safety Protection by blackt electrotech
- **How much does it cost?** € 30.49 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/650226288-blackt-electrotech-bt51a-wireless-motion-sensor-alarm-with-intelligent-welcome)

## 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

- • **Dual-Mode Alert System:** Seamlessly switch between security alarm and warm welcome tones to suit your space and mood.
- • **Customizable Volume Control:** Four volume levels up to 110dB let you tailor alerts from discreet to attention-grabbing.
- • **Effortless DIY Installation:** Compact design with wall mount or tape options—setup in minutes, no tools required.
- • **Versatile Placement Options:** Ideal for homes, offices, gates, and retail spaces—security and hospitality in one sleek device.
- • **Smart Infrared Motion Detection:** Sensitive sensor covers an 8-meter radius, catching every movement with precision.

## Overview

The BT51A Wireless Motion Sensor Alarm by Blackt Electrotech combines an 8-meter infrared motion detector with a powerful 110-decibel alarm and customizable welcome tones. Designed for easy installation and versatile use, it offers dual functionality as both a security alert and a friendly doorbell, making it perfect for modern homes and professional spaces seeking smart, reliable protection.

## Description

Product Description Blackt Electrotech BT51A Wireless Motion Sensor Alarm with Intelligent Welcome Doorbell The Blackt Electrotech BT51A Wireless Motion Sensor Alarm is an all-in-one security solution designed to enhance the safety of your home or business. Featuring an integrated intelligent welcome doorbell, infrared motion detection, gate alert alarm, and a remote control for easy operation, this system offers comprehensive protection and peace of mind. Whether you're at home or away, the BT51A ensures you're always alerted to activity around your property, providing a modern, hassle-free security solution for daily protection. Gate Alert Alarm for Extra Protection The gate alert alarm function allows you to monitor activity around your gate or property boundary. When movement is detected near the gate, the system sounds an alert, keeping you informed about any potential threats or visitors. This added feature ensures that no one approaches your property unnoticed, providing complete perimeter security for your home. Easy Installation for Instant Protection The Blackt Electrotech BT51A is designed with ease of installation in mind. With no complicated wiring required, you can quickly set up the system and begin using it immediately. The wireless design ensures a hassle-free setup, so you can start protecting your property without the need for professional installation.

Review: Allover funcation and utility - Very nice useful product. Having multiple usages like: When ever anyone is passing through its range,it gives the alert like: Any animal is passing, you can set the alert tone as dog barking If you want to welcome your guest, you car set the Welcome tone. Even you can set the tone of call bell. The Welcome tone is having multiple languages of your choice. It operates on 3 AAA Batteries or even with micro usb. I recommend this product may be used and installed near your main gate or even at front door of your house as you wish. Installation is very easy,anyone can do it on their own.
Review: Good - Very good product allmost but range is only 8 feet other function like sound, and bell is very good

## Features

- 🔄 [2-in-1 Functionality]: Can be used both as a security alert system and in welcome mode, offering versatility for different use cases.
- 🔊 [Flexible Volume Adjustment]: Choose from four adjustable volume levels (0 to 110 decibels) for personalized comfort and security.
- 🔍 [Sensitive Infrared Sensor]: Detects motion within an 8-meter range, enhancing security and providing alerts in various locations.
- 🚨 [Accurate & Effective Security Alert]: The 110-decibel alarm effectively notifies occupants of guests or intrusions, ensuring preparedness and peace of mind.
- 🏠 [Wider Range of Applications]: Perfect for front entrances, galleries, gates, walkways, apartments, offices, hotels, stores, and more.
- 🛠️ [Simple Installation Design]: Easy to set up—place the detector on a table or attach with double-sided tape for a quick and secure installation.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0DBL4D681 |
| Audible Noise | 110 Decibels |
| Battery Description | Alkaline |
| Best Sellers Rank | #6,134 in Home Improvement ( See Top 100 in Home Improvement ) #10 in Motion Detectors |
| Brand | Blackt Electrotech |
| Built-In Media | Remote |
| Colour | white |
| Control Method | Remote |
| Country of Origin | China |
| Customer Reviews | 3.7 out of 5 stars 131 Reviews |
| Importer Contact Information | Blackt Electrotech |
| Item Type Name | Motion Sensor Detector Gate Alert Alarm |
| Item Weight | 150 Grams |
| Manufacturer | Blackt Electrotech |
| Maximum Range | 8 metres |
| Mfr Part Number | BT51A |
| Model Number | BT51A |
| Mounting Type | Wall Mount |
| Packer Contact Information | Blackt Electrotech |
| Power Source | Battery Powered |
| Sensor Technology | Infrared Sensor |
| Size | Small |
| Smart Home Compatibility | Not Smart Home Compatible |
| Voltage | 5 Volts |

## Product Details

- **Battery Description:** Alkaline
- **Brand:** Blackt Electrotech
- **Colour:** white
- **Power Source:** Battery Powered
- **Voltage:** 5 Volts

## Images

![Blackt Electrotech BT51A Wireless Motion Sensor Alarm with Intelligent Welcome Doorbell, Infrared Detector, Gate Alert Alarm, Remote Control, Easy Install for Daily Safety Protection - Image 1](https://m.media-amazon.com/images/I/51AJw6NMMVL.jpg)
![Blackt Electrotech BT51A Wireless Motion Sensor Alarm with Intelligent Welcome Doorbell, Infrared Detector, Gate Alert Alarm, Remote Control, Easy Install for Daily Safety Protection - Image 2](https://m.media-amazon.com/images/I/61+De4PIaGL.jpg)
![Blackt Electrotech BT51A Wireless Motion Sensor Alarm with Intelligent Welcome Doorbell, Infrared Detector, Gate Alert Alarm, Remote Control, Easy Install for Daily Safety Protection - Image 3](https://m.media-amazon.com/images/I/61B2U0KkPbL.jpg)
![Blackt Electrotech BT51A Wireless Motion Sensor Alarm with Intelligent Welcome Doorbell, Infrared Detector, Gate Alert Alarm, Remote Control, Easy Install for Daily Safety Protection - Image 4](https://m.media-amazon.com/images/I/619PfQ5+ziL.jpg)
![Blackt Electrotech BT51A Wireless Motion Sensor Alarm with Intelligent Welcome Doorbell, Infrared Detector, Gate Alert Alarm, Remote Control, Easy Install for Daily Safety Protection - Image 5](https://m.media-amazon.com/images/I/71AI7K1msuL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Allover funcation and utility
*by J***R on 30 October 2025*

Very nice useful product. Having multiple usages like: When ever anyone is passing through its range,it gives the alert like: Any animal is passing, you can set the alert tone as dog barking If you want to welcome your guest, you car set the Welcome tone. Even you can set the tone of call bell. The Welcome tone is having multiple languages of your choice. It operates on 3 AAA Batteries or even with micro usb. I recommend this product may be used and installed near your main gate or even at front door of your house as you wish. Installation is very easy,anyone can do it on their own.

### ⭐⭐⭐⭐ Good
*by V***T on 24 July 2025*

Very good product allmost but range is only 8 feet other function like sound, and bell is very good

### ⭐⭐⭐⭐⭐ No. 1 sensor alarm product.
*by J***B on 28 November 2025*

Received the order ontime. Super packing and amazing product. Thanks a lot🙏

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*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-05-23*