--- product_id: 107179234 title: "Entry Sensor, Detects Opened and Closed Doors or Windows, Sends Alerts, Triggers Siren, 2-Year Battery Life, Indoor-use Only, Requires HomeBase S280 or HomeBase S380" brand: "eufy security" price: "£22.63" currency: GBP in_stock: true reviews_count: 13 url: https://www.desertcart.co.uk/products/107179234-entry-sensor-detects-opened-and-closed-doors-or-windows-sends 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, Sends Alerts, Triggers Siren, 2-Year Battery Life, Indoor-use Only, Requires HomeBase S280 or HomeBase S380 **Brand:** eufy security **Price:** £22.63 **Availability:** ✅ In Stock ## Summary > 🚨 Secure your space, stay one step ahead! ## Quick Answers - **What is this?** Entry Sensor, Detects Opened and Closed Doors or Windows, Sends Alerts, Triggers Siren, 2-Year Battery Life, Indoor-use Only, Requires HomeBase S280 or HomeBase S380 by eufy security - **How much does it cost?** £22.63 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/107179234-entry-sensor-detects-opened-and-closed-doors-or-windows-sends) ## 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 - • **Powerful 100dB Siren:** Deter intruders instantly with a loud siren triggered directly from your HomeBase. - • **Instant Intrusion Alerts:** Receive real-time smartphone notifications the moment your door or window is opened. - • **Seamless Door & Window Fit:** Sleek, compact design that blends effortlessly with any entry point for discreet protection. - • **Unmatched 800-Day Battery Life:** Stay worry-free with over two years of continuous security monitoring on a single battery. - • **Effortless Peel & Stick Installation:** Get your security up and running in minutes—no tools or hassle required. ## Overview The eufy Security Entry Sensor offers reliable indoor protection by detecting opened or closed doors and windows. It features a long-lasting 2-year battery, instant smartphone alerts, and a powerful 100-decibel siren triggered via the HomeBase system. Designed for easy peel-and-stick installation, this compact sensor seamlessly integrates into your smart home setup, ensuring peace of mind with minimal effort. ## Description T8900 intrusion sensor FAQ and assistance 1. Are batteries included? - Yes, one CR123A battery is included. 2. Can I connect my own router to the eufy Security Sensor? - No, only the eufy Security HomeBase can be used for the intrusion sensor. 3. Is it possible to use it outdoors? - No, the material is not weatherproof and intended for indoor use only. 4. How do I know the battery is getting weak? - If the battery is less than 10%, a notification will be sent. 5. How do I install the sensor in the entrance area? - Step: Peel off the tape and stick or screw the sensor to the selected door or window. - Step: Attach the magnetic part to the door area or window area with the inscription "Magnet". - Note: Please check that the distance between magnet and sensor is less than 3.5 cm. ## 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.*Push notifications with thumbnail previews require thumbnail preview images to be temporarily stored in the cloud. - Easy Installation: Just peel off the mounting tape and stick or screw the sensor onto the door or window you want to monitor. - What’s Included: Entry Sensor, CR123A Battery, Magnet, 3 x Mounting Screws, Owner's Manual. ## Technical Specifications | Specification | Value | |---------------|-------| | Asin | B07JJD6CFV | | Battery Description | Lithium | | Best Sellers Rank | 16,072 in DIY & Tools (See Top 100 in DIY & Tools) 18 in Home Security Door & Window Sensors | | Brand | eufy Security | | Colour | White | | Compatible Devices | Smartphone | | Control Method | App | | Country Of Origin | China | | Customer Reviews | 4.6 4.6 out of 5 stars (2,821) 4.6 out of 5 stars | | Eu Spare Part Availability Duration | 2 Years | | Included Components | Entry Sensor | | Item Dimensions L X W X H | 7.4L x 2.8W x 2.2H centimetres | | Item Weight | 0.15 Pounds | | Manufacturer | Anker | | Model Number | AK-T89003D3 | | Mounting Type | Door Mount | | Number Of Batteries | 1 AAA batteries required. (included) | | Part Number | AK-T89003D3 | | Power Source | Battery Powered | | Sensor Technology | Contact Sensor | | Size | Entry sensor | | Smart Home Compatibility | Smart Home Compatible | | Sound Level | 100 Decibels | | Unit Count | 1.0 count | | Upc | 848061046427 | ## Product Details - **Brand:** eufy Security - **Colour:** White - **Compatible devices:** Smartphone - **Power source:** Battery Powered - **Product dimensions:** 7.4L x 2.8W x 2.2H centimetres ## Images ![Entry Sensor, Detects Opened and Closed Doors or Windows, Sends Alerts, Triggers Siren, 2-Year Battery Life, Indoor-use Only, Requires HomeBase S280 or HomeBase S380 - Image 1](https://m.media-amazon.com/images/I/5161rwtCsHL.jpg) ## Questions & Answers **Q: Does this sensor work with the Homebase 2 that comes with the eufycam 2?** A: Yes, it works with the Homebase 2. **Q: Can this be used in an alexa routine as a trigger? E.g. door opens then Alexa announces and turns on a light.** A: No I can’t seem to get this working using. I can create a routine in Alexa and manually run it, but the trigger from the sensor doesn’t fire it. Googling seems to be missing functionality in their product. Gutted. **Q: Can the sensor be turned off completely? I mean there are any buttons on the sensor itself to turn it completely off?** A: No, there are no buttons on the sensor to turn it off. You can take the battery out if you want to disable it.... but the idea is to set the on/off condition using the app. Different alert modes can have different on/off settings. **Q: I used to get instant notification if it was open. It now only gives me a notification after a set time? Can I have an instant notification?** A: The developers seem to mess with the app a lot. I used to get notifications when my door sensors opened and closed. Now I only get them when the door opens. Sometimes it nevers registers as having closed. Very annoying. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Great product, highly recommended. *by on Reviewed in the United Kingdom 1 April 2026* I recently added the Eufy Security Entry Sensor to my home setup, and I’m really impressed with how well it works.The setup was very simple and quick, especially if you already have the Eufy system. It connects easily to the HomeBase and the app is very straightforward to use, so you can get everything up and running in no time.In terms of performance, it does exactly what you need. It instantly detects when a door or window is opened and sends alerts straight to your phone, giving you peace of mind when you're not at home. It can also trigger an alarm through the HomeBase, which is a great added security feature.The battery life is excellent as well, lasting a long time without needing to be replaced, which makes it very low maintenance.Overall, this is a great product—reliable, easy to use, and a perfect addition to any home security system. If you already use Eufy or are looking to improve your home security, I would definitely recommend it. ### ⭐⭐⭐⭐⭐ Easy, Simple, Efficient. *by on Reviewed in the United Kingdom 29 September 2025* Easy to install and set up. I already have the homebase 3 and numerous other eufy devices. Very small and placed in the top corner of the door and isn't noticeable unless you know it's there. You can change all the settings via the eufy app which I find it very user friendly and the forums are brilliant if you get stuck! ### ⭐⭐⭐⭐⭐ Simple setup, for now, really reliable. *by on Reviewed in the United Kingdom 15 April 2026* Setup was easy, and it detects really reliably when doors are open. Have a nice feature that you can get a notification if the doors are open for some time, useful if you have kids who do not always close the door. Or you forget to close the terrace before going to bed. ## Frequently Bought Together - eufy Security, Entry Sensor, Detects Opened and Closed Doors or Windows, Sends Alerts, Triggers Siren, 2-Year Battery Life, Indoor-use Only, Requires HomeBase S280 or HomeBase S380 - eufy Security Home Alarm System Motion Sensor, 100° Coverage, 30 ft Detection Range, 2-Year Battery Life, Adjustable Sensitivity (HomeBase Required) - eufy Security Siren, 105 dB Wireless Alarm, IP65 Weatherproof, Remote Alerts, 2-Year Battery Life, HomeBase Required, Compatible with HomeBase S380 and S280, App Control, Easy to Install --- ## 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/107179234-entry-sensor-detects-opened-and-closed-doors-or-windows-sends](https://www.desertcart.co.uk/products/107179234-entry-sensor-detects-opened-and-closed-doors-or-windows-sends) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-06-27*