--- product_id: 123444747 title: "Entry Sensor, Detects Opened and Closed Doors or Windows, Door Monitoring, Sends Alerts, Triggers Siren, 2-Year Battery Life, Indoor Use Only, Requires HomeBase, 24/7 Monitoring Optional" brand: "eufy security" price: "£32.69" currency: GBP in_stock: true reviews_count: 13 category: "Eufy Security" url: https://www.desertcart.co.uk/products/123444747-entry-sensor-detects-opened-and-closed-doors-or-windows-door store_origin: GB region: United Kingdom --- # 100-decibel siren alert 2-year battery life Fits any door/window frame Entry Sensor, Detects Opened and Closed Doors or Windows, Door Monitoring, Sends Alerts, Triggers Siren, 2-Year Battery Life, Indoor Use Only, Requires HomeBase, 24/7 Monitoring Optional **Brand:** eufy security **Price:** £32.69 **Availability:** ✅ In Stock ## Summary > 🔐 Elevate your home security game—because peace of mind is the new luxury. ## Quick Answers - **What is this?** Entry Sensor, Detects Opened and Closed Doors or Windows, Door Monitoring, Sends Alerts, Triggers Siren, 2-Year Battery Life, Indoor Use Only, Requires HomeBase, 24/7 Monitoring Optional by eufy security - **How much does it cost?** £32.69 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/123444747-entry-sensor-detects-opened-and-closed-doors-or-windows-door) ## Best For - eufy security enthusiasts ## Why This Product - Trusted eufy security brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Unmatched 800-Day Power:** Enjoy hassle-free security with a single battery lasting over two years—set it and forget it. - • **Instant Intrusion Alerts:** Get real-time smartphone notifications the moment your door or window is opened. - • **Loud 100dB Siren Defense:** Deter intruders instantly with a powerful siren triggered on forced entry. - • **Seamless Door & Window Fit:** Sleek, compact design that blends effortlessly on any entry point for discreet protection. - • **Optional 24/7 Professional Monitoring:** Upgrade to round-the-clock emergency response for ultimate peace of mind. ## Overview The eufy Security Entry Sensor is a compact, indoor contact sensor designed to monitor doors and windows with precision. Featuring a robust 2-year battery life, it pairs exclusively with the eufy HomeBase to send instant alerts and trigger a 100-decibel siren upon forced entry. Optional 24/7 professional monitoring enhances emergency response, making it a reliable cornerstone for any smart home security ecosystem. ## Description Product description eufy security alarm system Water and Freeze Sensor Entry Sensor Motion Sensor 5-Piece Home Alarm Kit Siren Review: Eufy ecosystem works well - The Eufy ecosystem is very good, I’ve had it for five years now. Just needed more entry sensors which was easy to synchronize or connect to the WiFi and the system and it works well. The adhesive is good, it sticks properly to the surface of my window really good. I would recommend the entire Eufy ecosystem if you want a reliable security system for your home. Remember you can set up the entire system yourself. It’s that easy. Review: Unimpressed at first. But stay tuned! - Lots of potential. Hardware is very well designed. Software feels like it’s still under development. We’ve recently purchased many eufy security products. These sensors pair easily to my eufy homebase 2 and read the door’s open-close status reliability. However, Because of the software, they seem pretty useless. Right now, I can “arm” my eufy security system and an alarm will sound when the door is opened. That’s good. But the app requires many taps to arm/disarm the system and there’s currently no integration with other systems like HomeKit or August. I expect one big button to arm/disarm all my smart home security devices. Adding integrations to arm/disarm the system or Siri Shortcuts would be a big improvement! Additionally, the sensor has no chime feature with the homebase making it useless unless the system is “Armed”. It would be very useful to hear a pleasant chime from the homebase or the eufy video doorbell chime when my young kids open the door unsupervised. Ultimately, it’s a neat add-on to my eufy cameras, but features seem a bit raw or missing. I’m hopeful eufy will continue development. Update: Anker emailed me about my review and apologized for the experience. As part of the apology they sent a cool little battery bank. I’m glad they care and are paying attention. I hope this means they’re adding my requested software changes. Unfortunately for Anker, my review doesn’t change until they change how this product integrates with the rest of the system. More updates: Anker/eufy has continued to pursue total satisfaction. I must say I’m impressed. If they’re product development work’s nearly as hard as their customer service, they’ll be adding my requested changes in no time. Along with this update I must mention an announcement by eufy at CES 2020. Eufy is releasing a new keypad with home/away buttons thereby satisfying one of my major complaints with this system as an alarm. I am increasing my rating from 3 stars to 5 stars out of optimism for future updates as well as outstanding customer service. Update 7/8/2020 The requested door chime feature has been added. Now a pleasant chime is made by the hombase2 when a door is opened. They still lack in integration even among their own products. If I arm the alarm system, (camera, motion, and door sensors paired to the homebase2) other devices like the floodlight cam outside are unaffected and do not switch into an “away” mode without additional action in the app. ## Features - 2-year Battery Life: One battery provides 800 days of monitoring. - For Doors And Windows: Compact and versatile design fits onto any door or window frame. Requires eufy Security HomeBase. - 100-decibel Siren: Enable or disable siren protection, which triggers a 100-decibel siren on HomeBase, and sends an alert to your smartphone when forced entry is detected. - Optional 24/7 Protection Service: New optional 24/7 professional monitoring service is now available for 24/7 emergency police, fire and medical response when your alarm system is triggered. - What's Included: Entry Sensor, CR123A Battery, Magnet, 3 x Mounting Screws, Owner's Manual. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07GJJZZ3G | | Audible Noise | 100 Decibels | | Battery Description | Lithium | | Best Sellers Rank | #73 in Home Security Systems | | Brand | eufy Security | | Built-In Media | Entry Sensor, CR123A Battery, Magnet, 3 x Mounting Screws, Owner's Manual, Happy Card. | | Color | white | | Compatible Devices | Smartphone | | Control Method | App | | Customer Reviews | 4.6 out of 5 stars 1,996 Reviews | | EU Spare Part Availability Duration | 2 Years | | Global Trade Identification Number | 00848061058666 | | Item Dimensions L x W x H | 1.1"L x 0.87"W x 2.91"H | | Item Weight | 0.15 Pounds | | Manufacturer | eufy security | | Manufacturer Warranty Description | 12-month warranty and provide friendly, easy-to-reach support. | | Mfr Part Number | AK-848061058666 | | Model Number | T8900 | | Mounting Type | Door Mount, Window Mount | | Number of Batteries | 1 Lithium Ion batteries required. (included) | | Power Source | Battery Powered | | Product Dimensions | 1.1"L x 0.87"W x 2.91"H | | Sensor Technology | Contact Sensor | | Size | 1 Count (Pack of 1) | | Smart Home Compatibility | Smart Home Compatible | | UPC | 848061058666 | | Unit Count | 1.0 Count | | Wattage | 7.5 watts | ## Product Details - **Brand:** eufy Security - **Color:** white - **Compatible Devices:** Smartphone - **Power Source:** Battery Powered - **Product Dimensions:** 1.1"L x 0.87"W x 2.91"H ## Images ![Entry Sensor, Detects Opened and Closed Doors or Windows, Door Monitoring, Sends Alerts, Triggers Siren, 2-Year Battery Life, Indoor Use Only, Requires HomeBase, 24/7 Monitoring Optional - Image 1](https://m.media-amazon.com/images/I/5161rwtCsHL.jpg) ![Entry Sensor, Detects Opened and Closed Doors or Windows, Door Monitoring, Sends Alerts, Triggers Siren, 2-Year Battery Life, Indoor Use Only, Requires HomeBase, 24/7 Monitoring Optional - Image 2](https://m.media-amazon.com/images/I/61MvOb6Le2L.jpg) ![Entry Sensor, Detects Opened and Closed Doors or Windows, Door Monitoring, Sends Alerts, Triggers Siren, 2-Year Battery Life, Indoor Use Only, Requires HomeBase, 24/7 Monitoring Optional - Image 3](https://m.media-amazon.com/images/I/712Wx1pqmvL.jpg) ![Entry Sensor, Detects Opened and Closed Doors or Windows, Door Monitoring, Sends Alerts, Triggers Siren, 2-Year Battery Life, Indoor Use Only, Requires HomeBase, 24/7 Monitoring Optional - Image 4](https://m.media-amazon.com/images/I/61PyqNLdy+L.jpg) ![Entry Sensor, Detects Opened and Closed Doors or Windows, Door Monitoring, Sends Alerts, Triggers Siren, 2-Year Battery Life, Indoor Use Only, Requires HomeBase, 24/7 Monitoring Optional - Image 5](https://m.media-amazon.com/images/I/61fzKOXlOHL.jpg) ## Questions & Answers **Q: Notification if a door is left open? Is there a way to set a delay lets say 5 mins so if the door left open for 5 min or more, it notifies via alert?** A: Yes, after 5 mins and many other options. Please see the video. **Q: How many eufy security ***entry sensors** can be used per base station? how many cameras can i use simultaneously with said sensors?** A: One HomeBase can support up to 16 cameras and 16 entry sensor. **Q: Does the updated homebase 2 firmware expose these sensors to apple's homekit?** A: We are sorry that these sensors cannot support homekit. **Q: If power is lost and you have the plus monitoring service will you get notified of the power outage?** A: I am going to say no. It has to check in with them over the Internet and there could be numerous reasons that communications don't reach them. I would be surprised if it does actually check in regularly instead of just waiting to send an alarm alert. On my old alarm it has a battery backup and uses the landline phone to call in issues. So, if the power goes out it will use the battery backup to make a landline call and then the monitoring station will call me. Usually when the battery is low. I could be wrong but it's unlikely this configuration could support that notification. If you have a UPS that keeps your internet powered up then it, or the PC, can be configured to send an alert then it goes to battery. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Eufy ecosystem works well *by R***E on December 18, 2025* The Eufy ecosystem is very good, I’ve had it for five years now. Just needed more entry sensors which was easy to synchronize or connect to the WiFi and the system and it works well. The adhesive is good, it sticks properly to the surface of my window really good. I would recommend the entire Eufy ecosystem if you want a reliable security system for your home. Remember you can set up the entire system yourself. It’s that easy. ### ⭐⭐⭐⭐⭐ Unimpressed at first. But stay tuned! *by N***N on December 8, 2019* Lots of potential. Hardware is very well designed. Software feels like it’s still under development. We’ve recently purchased many eufy security products. These sensors pair easily to my eufy homebase 2 and read the door’s open-close status reliability. However, Because of the software, they seem pretty useless. Right now, I can “arm” my eufy security system and an alarm will sound when the door is opened. That’s good. But the app requires many taps to arm/disarm the system and there’s currently no integration with other systems like HomeKit or August. I expect one big button to arm/disarm all my smart home security devices. Adding integrations to arm/disarm the system or Siri Shortcuts would be a big improvement! Additionally, the sensor has no chime feature with the homebase making it useless unless the system is “Armed”. It would be very useful to hear a pleasant chime from the homebase or the eufy video doorbell chime when my young kids open the door unsupervised. Ultimately, it’s a neat add-on to my eufy cameras, but features seem a bit raw or missing. I’m hopeful eufy will continue development. Update: Anker emailed me about my review and apologized for the experience. As part of the apology they sent a cool little battery bank. I’m glad they care and are paying attention. I hope this means they’re adding my requested software changes. Unfortunately for Anker, my review doesn’t change until they change how this product integrates with the rest of the system. More updates: Anker/eufy has continued to pursue total satisfaction. I must say I’m impressed. If they’re product development work’s nearly as hard as their customer service, they’ll be adding my requested changes in no time. Along with this update I must mention an announcement by eufy at CES 2020. Eufy is releasing a new keypad with home/away buttons thereby satisfying one of my major complaints with this system as an alarm. I am increasing my rating from 3 stars to 5 stars out of optimism for future updates as well as outstanding customer service. Update 7/8/2020 The requested door chime feature has been added. Now a pleasant chime is made by the hombase2 when a door is opened. They still lack in integration even among their own products. If I arm the alarm system, (camera, motion, and door sensors paired to the homebase2) other devices like the floodlight cam outside are unaffected and do not switch into an “away” mode without additional action in the app. ### ⭐⭐⭐⭐⭐ A Thumbs Up! *by J***N on September 3, 2025* This is the second unit that I have bought. The first was about 4 years ago probably when eufy first brought it out. I was pleased with it then and am still. The device has proven to be completely reliable. I decided to alarm the my outside garage door which is used by service personnel on a regular basis. Mounting the two pieces was easy using the applied sticky pads. The sensor/transmitter per the instructions can be attached with screws. The two pieces can be installed on any standard and patio doors. The audio alert can be heard throughout my house as the volume and signal can be set in the app. The eufy home base and app allows me to receive notices on my phone when away. The sensor/transmitter uses a not so common battery that is said to last 8 months. I've changed the battery in my original unit once in 4 years. I've installed another manufacturer's door and window sensors in another house. The unit is much smaller and uses 2032 batteries that in my experience don't seem to last as long as the eufy battery. On a door the eufy size is not a problem. I can recommend it as I just bought my third unit. ## Frequently Bought Together - eufy Security Entry Sensor, Detects Opened and Closed Doors or Windows, Door Monitoring, Sends Alerts, Triggers Siren, 2-Year Battery Life, Indoor Use Only, Requires HomeBase, 24/7 Monitoring Optional - eufy Security 5-Piece Home Alarm Kit, Home Security System, Keypad, Motion Sensor, 2 Entry Sensors, Home Alarm System, Control from The App, Links with eufyCam, Optional 24/7 Protection - eufy Security Motion Sensor, Home Alarm System, 100° Coverage, 30 ft Detection Range, 2-Year Battery Life, Adjustable Sensitivity, HomeBase Required, Optional 24/7 Protection Service, Home Security --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co.uk/products/123444747-entry-sensor-detects-opened-and-closed-doors-or-windows-door](https://www.desertcart.co.uk/products/123444747-entry-sensor-detects-opened-and-closed-doors-or-windows-door) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-05-21*