---
product_id: 435534890
title: "Zigbee Contact Sensor 4 Pack, Door and Window Monitor, Home Automation,Works with Home Assistant,SmartThings,Aeotec,Homey,Hubitat or Echo Devices with Build-in Zigbee Hub,hub Required"
brand: "thirdreality"
price: "₨2633"
currency: SCR
in_stock: true
reviews_count: 13
category: "Thirdreality"
url: https://www.desertcart.sc/products/435534890-zigbee-contact-sensor-4-pack-door-and-window-monitor-home
store_origin: SC
region: Seychelles
---

# Hassle-free instant setup Zigbee standard compatible 2-year battery life Zigbee Contact Sensor 4 Pack, Door and Window Monitor, Home Automation,Works with Home Assistant,SmartThings,Aeotec,Homey,Hubitat or Echo Devices with Build-in Zigbee Hub,hub Required

**Brand:** thirdreality
**Price:** ₨2633
**Availability:** ✅ In Stock

## Summary

> 🚪🔔 Stay ahead of every open door moment—smart security that just works!

## Quick Answers

- **What is this?** Zigbee Contact Sensor 4 Pack, Door and Window Monitor, Home Automation,Works with Home Assistant,SmartThings,Aeotec,Homey,Hubitat or Echo Devices with Build-in Zigbee Hub,hub Required by thirdreality
- **How much does it cost?** ₨2633 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sc](https://www.desertcart.sc/products/435534890-zigbee-contact-sensor-4-pack-door-and-window-monitor-home)

## Best For

- thirdreality enthusiasts

## Why This Product

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

## Key Features

- • **Custom Alexa Routines:** Trigger lights, alerts, or even jokes when doors open—turn security into smart entertainment.
- • **Instant Alexa Discovery:** Say 'Alexa, discover devices' and watch your sensors pop up in seconds—no tech headaches.
- • **Ultra-Long Battery Life:** Up to 2 years on just 2 AAA batteries—set it and forget it, no constant replacements.
- • **Seamless Zigbee Integration:** Effortlessly syncs with Echo, SmartThings, Home Assistant & more for smart home harmony.
- • **Real-Time Monitoring & Alerts:** Track battery status and sensor history via Third Reality app with low battery email warnings.

## Overview

The THIRDREALITY Zigbee Contact Sensor 4 Pack offers reliable door and window monitoring with seamless Zigbee compatibility across major smart home hubs like Echo, SmartThings, and Home Assistant. Featuring a 2-year battery life, quick Alexa-enabled setup, and customizable routines, it empowers professionals to secure their homes effortlessly while staying connected through real-time alerts and app-based monitoring.

## Description

THIRDREALITY Zigbee Contact Sensor 4 Pack, Door and Window Monitor, Home Automation,Works with Home Assistant,SmartThings,Aeotec,Homey,Hubitat or Echo Devices with Build-in Zigbee Hub,hub Required - desertcart.com

Review: A bit big, but it's ThirdReality so it just works - These are great door/window sensors that have been super reliable for me so far. I was tired of a few other brands falling off my Zigbee network, so I went to trusty ThirdReality and haven't been disappointed. They are a bit bigger than alternatives, but that's because they pack a couple of AAA batteries which I expect to last a long time (given their record with other Zigbee devices). It's been several weeks and no battery issues so far; I would guess they'll last months or even years depending on usage. ThirdReality is also a Home Assistant partner, which means they actually test their stuff with Home Assistant and ZHA for their Zigbee stuff. It's perfectly compatible with my Sonoff Zigbee radio, as well as the Home Assistant ZBT-2 I recently switched to. They're a bit on the large size and not particularly pretty, but I don't think you could find a more reliable contact sensor for doors or windows (or drawers, or car chargers, or toilet lids… whatever you freaks are automating!) or a better value anywhere else. If you have the physical space, I'd highly recommend them!
Review: Simple, Reliable, Power Efficient - I purchased these to help with various automations around the house including turning lights on and off, warning if freezer/refrigerator doors are left open, etc. and they work perfectly with my Home Assistant setup. The devices were instantly recognized by my Sonoff Zigbee 3.0 USB Dongle Plus (connected to my Pi5 running Home Assistant) and I could setup everything from there. So far, zero complaints as they work like a charm. For those folks frustrated with the mounting tape included with these such that upon removal the devices can crack, I simply used 3M Command Damage-Free Hanging Strips to make moving them super easy. Attached is a picture of the one I have installed atop the inside of my pantry door. I moved it from one spot to another using the Command strip and it came off damage free.

## Features

- ZIGBEE STANDARD COMPATIBLE DOOR SENSOR: Works with compatible Zigbee hubs or Echo devices with Zigbee hub built-in. Such as Echo (4th Gen), Echo Plus (1st Gen and 2nd Gen), Echo Studio, Eero 6, Eero Pro 6, Home Assistant, Home Assistant, SmartThings 2015/2018, Aeotec, Hubitat, Homey Bridge, Homey Pro, Third reality Hub and Third Reality Smart Speakers.
- HASSLE-FREE SETUP: Installs in a few seconds. Just make sure device in paring mode and compatible Echo device automatically discovers it by saying “Alexa, discover devices”.
- SUIT FOR MOSTLY DOORS AND WINDOWS OF THE HOUSE AND 2-YEARS LONG BATTERY LIFE: Door Sensor uses two AAA 1.5V Alkaline batteries for power, the batteries can last for up to 2 years and it is very easy to replace them. Note: Indoor use only and do not install the Door Sensor on metal door or window.
- MORE FUN WITH ALEXA ROUTINES: Using the Alexa app, create your own routines that are triggered When door or window is open, turn on a light, send an alert to your phone, let Alexa make a voice alarm or make a joke, etc.
- UPGRADED THIRD REALITY APP AND SKILL FUNCTIONS: Connected with Third Reality Hub/Speaker, you can check the battery level in the APP, then replace the batteries in time; history record is also open to the users, so you can know when the state of the movement has been detected and deal with it in time. Enabled Third Reality Skill in the Alexa APP, you will have a low battery warning by emails.
- More Smart Assistant Supported: Enabled by Smart Bridge MZ1 (Sold Separately), integrates with Apple HomeKit, Google Home, desertcart Alexa (Smart Speaker required) and SmartThings, to achieve easy control and monitoring. Additionally, it supports software OTA (Over-The-Air) updates, allowing for effortless firmware upgrades

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B09XCZJMC5 |
| Batteries | 8 AAA batteries required. |
| Batteries Included? | No |
| Batteries Required? | No |
| Battery Cell Type | Alkaline |
| Best Sellers Rank | #16,330 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #39 in Home Automation Devices |
| Brand | THIRDREALITY |
| Color | White |
| Customer Reviews | 4.4 4.4 out of 5 stars (1,095) |
| Date First Available | December 3, 2021 |
| Description Pile | Alkaline |
| Included Components | Door Sensor × 4; AAA Battery × 8; Double-sided Tape × 4; Screw × 8 |
| Item Package Quantity | 1 |
| Item Weight | 10.2 ounces |
| Item dimensions L x W x H | 1.97 x 0.83 x 2.36 inches |
| Item model number | 3RDS17BZ |
| Manufacturer | Third Reality, Inc |
| Material | Plastic |
| Measuring Range | Binary: Open/Closed |
| Mounting Type | Door Mount |
| Output Type | Digital |
| Part Number | 3RDS17BZ |
| Power Source | Battery Powered |
| Product Dimensions | 1.97 x 0.83 x 2.36 inches |
| Specific Uses For Product | Contact Sensor |
| Style | Door Sensor 4 Pack |

## Product Details

- **Brand:** THIRDREALITY
- **Item Weight:** 0.29 Kilograms
- **Item dimensions L x W x H:** 1.97 x 0.83 x 2.36 inches
- **Material:** Plastic
- **Style:** Door Sensor 4 Pack

## Images

![Zigbee Contact Sensor 4 Pack, Door and Window Monitor, Home Automation,Works with Home Assistant,SmartThings,Aeotec,Homey,Hubitat or Echo Devices with Build-in Zigbee Hub,hub Required - Image 1](https://m.media-amazon.com/images/I/51j1EWmLzgL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ A bit big, but it's ThirdReality so it just works
*by C***Y on January 12, 2026*

These are great door/window sensors that have been super reliable for me so far. I was tired of a few other brands falling off my Zigbee network, so I went to trusty ThirdReality and haven't been disappointed. They are a bit bigger than alternatives, but that's because they pack a couple of AAA batteries which I expect to last a long time (given their record with other Zigbee devices). It's been several weeks and no battery issues so far; I would guess they'll last months or even years depending on usage. ThirdReality is also a Home Assistant partner, which means they actually test their stuff with Home Assistant and ZHA for their Zigbee stuff. It's perfectly compatible with my Sonoff Zigbee radio, as well as the Home Assistant ZBT-2 I recently switched to. They're a bit on the large size and not particularly pretty, but I don't think you could find a more reliable contact sensor for doors or windows (or drawers, or car chargers, or toilet lids… whatever you freaks are automating!) or a better value anywhere else. If you have the physical space, I'd highly recommend them!

### ⭐⭐⭐⭐⭐ Simple, Reliable, Power Efficient
*by S***B on December 14, 2025*

I purchased these to help with various automations around the house including turning lights on and off, warning if freezer/refrigerator doors are left open, etc. and they work perfectly with my Home Assistant setup. The devices were instantly recognized by my Sonoff Zigbee 3.0 USB Dongle Plus (connected to my Pi5 running Home Assistant) and I could setup everything from there. So far, zero complaints as they work like a charm. For those folks frustrated with the mounting tape included with these such that upon removal the devices can crack, I simply used 3M Command Damage-Free Hanging Strips to make moving them super easy. Attached is a picture of the one I have installed atop the inside of my pantry door. I moved it from one spot to another using the Command strip and it came off damage free.

### ⭐⭐⭐⭐⭐ Best choice
*by S***R on January 18, 2026*

Love these sensors. They pair almost instantly and are a great addition for my home assistant setup to automate all my lights. I’m also using them for my own local security system. Definitely the best value out there for sensors. You can’t go wrong with any Thirdreality product.

## Frequently Bought Together

- THIRDREALITY Zigbee Contact Sensor 4 Pack, Door and Window Monitor, Home Automation,Works with Home Assistant,SmartThings,Aeotec,Homey,Hubitat or Echo Devices with Build-in Zigbee Hub,hub Required
- THIRDREALITY ZigBee Smart Plug 4 Pack with Real-time Energy Monitoring,15A Outlet, Zigbee Repeater,ETL Certified,ZigBee Hub Required,Work with Home Assistant,Compatible Echo Devices and SmartThings
- THIRDREALITY Zigbee Motion Sensor 4 Pack, Zigbee Hub Required, Pet Friendly, Work with Home Assistant, SmartThings, Aeotec, Homey, Hubitat or Echo Devices with Built-in Zigbee hub

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*Product available on Desertcart Seychelles*
*Store origin: SC*
*Last updated: 2026-02-21*