---
product_id: 169038667
title: "Wolf-Guard 433MHz MC-03B Door Window Sensor for Home Guard System,Power Switch,Emergency Button"
brand: "wolf-guard"
price: "HK$158"
currency: HKD
in_stock: true
reviews_count: 11
category: "Wolf Guard"
url: https://www.desertcart.hk/products/169038667-wolf-guard-433mhz-mc-03b-door-window-sensor-for-home
store_origin: HK
region: Hong Kong
---

# Compact 3”x1”x0.5” size 433MHz wireless frequency 2+ years battery life Wolf-Guard 433MHz MC-03B Door Window Sensor for Home Guard System,Power Switch,Emergency Button

**Brand:** wolf-guard
**Price:** HK$158
**Availability:** ✅ In Stock

## Summary

> 🔐 Stay one step ahead—secure your sanctuary with Wolf-Guard’s smart sensor!

## Quick Answers

- **What is this?** Wolf-Guard 433MHz MC-03B Door Window Sensor for Home Guard System,Power Switch,Emergency Button by wolf-guard
- **How much does it cost?** HK$158 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hk](https://www.desertcart.hk/products/169038667-wolf-guard-433mhz-mc-03b-door-window-sensor-for-home)

## Best For

- wolf-guard enthusiasts

## Why This Product

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

## Key Features

- • **Long-Lasting Power:** Built-in CR2032 lithium battery keeps your security active for over 2 years without a fuss.
- • **Complete Security Kit:** Includes transmitter, magnetic bar, mounting sticks, and manual—everything you need to guard your space.
- • **Reliable Wireless Range:** Up to 80 meters of uninterrupted 433MHz signal for flexible placement anywhere at home.
- • **Seamless DIY Installation:** Peel, stick, and secure your home in seconds—no tools needed.
- • **Precision Alert Sensitivity:** Detects door/window openings within 15mm to instantly notify your alarm system.

## Overview

The Wolf-Guard 433MHz MC-03B Door Window Sensor is a compact, wireless contact sensor designed for home security systems. Operating on a reliable 433MHz frequency, it features a built-in CR2032 lithium battery lasting over 2 years, ensuring long-term protection. Easy to install with adhesive backing, it detects door or window openings within 15mm and transmits alerts up to 80 meters to your control host. This sensor kit includes all necessary components for quick setup, making it an essential upgrade for millennial professionals seeking smart, hassle-free home security.

## Description

Wolf-Guard 433MHz MC-03B Door Window Sensor for Home Guard System,Power Switch,Emergency Button : desertcart.co.uk: DIY & Tools

Review: Great find - Great bit of kit, working well
Review: Feel a lot safer now as I live alone - Easy to install, very satisfied

## Features

- SIZE:big 3”X1”X0.5” ,small 2.3”X0.5”X0.3”
- POWERFUL: built-in DC3V,CR2032 li battery, lasts for over 2 years
- BOX CONTENT: 1 transmitter and 1 magnetic bar,2 sticks,1 manual
- INSTALLATION:just peal the sticker and stick it,the small must be on the big right and bottom aligned
- SENSITIVE:work with home alarm system,it will send the alarm signal to control host once the door or window are opened only 15mm

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B077BX5NZZ |
| Batteries | 1 CR2 batteries required. (included) |
| Batteries Required? | Yes |
| Batteries included? | Yes |
| Battery Cell Type | Lithium Metal |
| Battery description | Lithium |
| Best Sellers Rank | 170,074 in DIY & Tools ( See Top 100 in DIY & Tools ) 157 in Home Security Door & Window Sensors |
| Control method | Remote |
| Customer Reviews | 4.0 4.0 out of 5 stars (90) |
| Date First Available | 29 Jan. 2018 |
| Delivery information | We cannot deliver certain products outside mainland UK ( Details ). We will only be able to confirm if this product can be delivered to your chosen address when you enter your delivery address at checkout. |
| Item Package Quantity | 1 |
| Item Weight | 30 g |
| Item model number | Door sensor |
| Item weight | 0.03 Kilograms |
| Manufacturer | ChiTongDa |
| Material | ABS |
| Maximum range | 80 Metres |
| Mounting type | Wall Mount |
| Number of batteries | 1 CR2 batteries required. (included) |
| Part Number | MC-03B-100 |
| Product Dimensions | 8 x 3 x 11 cm; 30 g |
| Sensor technology | Contact Sensor |
| Shape | Rectangular |
| UPC | 711005689656 |
| Usage | Home alarm systems |
| Voltage | 3 Volts |

## Product Details

- **Brand:** WOLF-GUARD
- **Colour:** White
- **Compatible devices:** Various
- **Power source:** Battery Powered
- **Product dimensions:** 8L x 3W x 11H centimetres

## Images

![Wolf-Guard 433MHz MC-03B Door Window Sensor for Home Guard System,Power Switch,Emergency Button - Image 1](https://m.media-amazon.com/images/I/31MnY4IGj0L.jpg)
![Wolf-Guard 433MHz MC-03B Door Window Sensor for Home Guard System,Power Switch,Emergency Button - Image 2](https://m.media-amazon.com/images/I/31iv4+uCTlL.jpg)
![Wolf-Guard 433MHz MC-03B Door Window Sensor for Home Guard System,Power Switch,Emergency Button - Image 3](https://m.media-amazon.com/images/I/412d2NqZZdL.jpg)
![Wolf-Guard 433MHz MC-03B Door Window Sensor for Home Guard System,Power Switch,Emergency Button - Image 4](https://m.media-amazon.com/images/I/416OK--WgtS.jpg)
![Wolf-Guard 433MHz MC-03B Door Window Sensor for Home Guard System,Power Switch,Emergency Button - Image 5](https://m.media-amazon.com/images/I/41ISuOzSQTL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great find
*by S***Y on 22 November 2025*

Great bit of kit, working well

### ⭐⭐⭐⭐⭐ Feel a lot safer now as I live alone
*by T***N on 8 June 2024*

Easy to install, very satisfied

### ⭐⭐⭐⭐⭐ Check product for functionality before fitting
*by A***S on 15 February 2023*

This replacement item worked at last, had 2 faulty ones before!

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**Shop now:** [https://www.desertcart.hk/products/169038667-wolf-guard-433mhz-mc-03b-door-window-sensor-for-home](https://www.desertcart.hk/products/169038667-wolf-guard-433mhz-mc-03b-door-window-sensor-for-home)

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*Product available on Desertcart Hong Kong*
*Store origin: HK*
*Last updated: 2026-02-03*