--- product_id: 625394282 title: "Smart Mailbox Alarm, Requires SBS50 Base Station, Wireless Long Range Mailbox Alert, Mailbox Sensor for Delivered Mail, SMA51" brand: "x-sense" price: "£22.97" currency: GBP in_stock: true reviews_count: 8 url: https://www.desertcart.co.uk/products/625394282-smart-mailbox-alarm-requires-sbs50-base-station-wireless-long-range store_origin: GB region: United Kingdom --- # IP65 waterproof durability 2.4 GHz long-range wireless 4-year battery life Smart Mailbox Alarm, Requires SBS50 Base Station, Wireless Long Range Mailbox Alert, Mailbox Sensor for Delivered Mail, SMA51 **Brand:** x-sense **Price:** £22.97 **Availability:** ✅ In Stock ## Summary > 📬 Stay ahead of the mail game—smart, sleek, and weatherproof! ## Quick Answers - **What is this?** Smart Mailbox Alarm, Requires SBS50 Base Station, Wireless Long Range Mailbox Alert, Mailbox Sensor for Delivered Mail, SMA51 by x-sense - **How much does it cost?** £22.97 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/625394282-smart-mailbox-alarm-requires-sbs50-base-station-wireless-long-range) ## Best For - x-sense enthusiasts ## Why This Product - Trusted x-sense brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Built to Brave Any Weather:** IP65-rated waterproof design with UV-resistant shell ensures reliable performance rain or shine. - • **Effortless Setup, Zero Wires:** 100% wire-free installation with included double-sided tape—set up in seconds, no tools required. - • **Seamless Multi-Device Sharing:** Share mailbox alerts with family or colleagues via the X-Sense app for effortless household coordination. - • **Instant Mail Alerts, Always in the Know:** Get real-time push notifications the moment your mail arrives—never miss a delivery again. - • **Long-Range Connectivity & Custom Control:** Connects up to 50 devices on 2.4 GHz Wi-Fi with customizable ringtones and volume up to 100 dB. ## Overview The X-Sense Smart Mailbox Alarm (SMA51) is a compact, wireless mailbox sensor that connects via 2.4 GHz Wi-Fi to the SBS50 base station (sold separately). It delivers instant app alerts for mail delivery, supports multi-user sharing, and offers customizable ringtones with volume up to 100 dB. Designed for all mailbox types with lids, it features a long-lasting 4-year battery, IP65 waterproof rating, and UV-resistant shell for reliable outdoor use. Easy to install and manage through the X-Sense Home Security App, it’s perfect for professionals seeking seamless home security integration. ## Description ["https://m.media-desertcart.com/images/S/aplus-media-library-service-media/a57e640a-f180-44d0-a5f1-5456dacbba1b.__CR0,0,1464,600_PT0_SX1464_V1___.jpg", "https://m.media-desertcart.com/images/S/aplus-media-library-service-media/ea999631-257a-4c18-bd6c-fae5783a4dc3.__CR0,0,1464,600_PT0_SX1464_V1___.jpg", "https://m.media-desertcart.com/images/S/aplus-media-library-service-media/0acd8a65-13ba-40ce-bc34-77f011d0c837.__CR0,0,1464,600_PT0_SX1464_V1___.jpg", "https://m.media-desertcart.com/images/S/aplus-media-library-service-media/e887a98c-1777-4210-b488-606a15ff80e6.__CR0,0,1464,600_PT0_SX1464_V1___.jpg", "https://m.media-desertcart.com/images/S/aplus-media-library-service-media/d1643458-afe8-470c-99c4-d6636edc17e5.__CR0,0,1464,625_PT0_SX1464_V1___.jpg", "https://m.media-desertcart.com/images/I/41BnyDAiKKL.__AC_SR166,182___.jpg", "https://m.media-desertcart.com/images/I/41FZVAqfTcL.__AC_SR166,182___.jpg", "https://m.media-desertcart.com/images/I/41YosTwtXiL.__AC_SR166,182___.jpg", "https://m.media-desertcart.com/images/I/41PHgkj6MNL.__AC_SR166,182___.jpg", "https://m.media-desertcart.com/images/S/aplus-media-library-service-media/5d1357b2-3c8a-4520-87fd-810a575d53ab.__AC_SR166,182___.jpg", "https://m.media-desertcart.com/images/S/aplus-media-library-service-media/06a343a0-db0c-4e35-921c-8a7fabab4a92.__AC_SR166,182___.jpg", "https://m.media-desertcart.com/images/S/aplus-media-library-service-media/d1c0eb1b-f223-4ee7-9b3e-841842ccef04.__AC_SR166,182___.jpg", "https://m.media-desertcart.com/images/S/aplus-media-library-service-media/bf1c2b53-3d8c-4320-96d5-bffb989e7fcc.__AC_SR166,182___.jpg"] ## Features - Note: Compatible only with 2.4 GHz Wi-Fi (not 5 GHz). Connects to the X-Sense Home Security App via the SBS50 base station (not included) - Customize Your Home Safety System: Includes 1 mailbox alarm (requires SBS50 base station, not included); each base station can connect up to 50 X-Sense devices, providing complete coverage for both your indoor and outdoor properties; customize your device names for easy location and management as needed - Real-Time Push Alerts & Multi-User Sharing: The moment your mail arrives, you'll receive an instant app push alert; manage various features from your phone, such as device sharing, mail reminder, one-button silence, adjusting volume up to 100 dB, and ringtone selection - Long-Distance Transmission, Accurate Detection: With extensive coverage, the smart mailbox alarm maintains a strong and reliable connection to the base station (not included) via a 2.4 GHz Wi-Fi network, and promptly sends notifications to your phone - Compatibility with Various Mailbox Types: This mailbox alarm is designed with a sleek and compact profile; compatible with curbside/post mount, wall mount, slot type, and cluster type mailboxes; not suitable for mail slots without lids - Extra Long Standby, Easy Setup: The replaceable battery offers a long 4-year lifespan based on 5 daily triggers; the alarm is 100% wire-free and easy to install using the double-sided tape included; following the in-app instructions, simply add it to the X-Sense app in seconds - Built for All-Weather Durability: With its IP65 waterproof rating and an operating temperature range of 14–140°F (-10–60°C), this wireless mailbox alarm operates reliably even in extreme weather; ASA shell and silicone seal prevent fading caused by sunlight and UV rays ## Technical Specifications | Specification | Value | |---------------|-------| | Asin | B0CYZKRH49 | | Audible Noise | 100 db | | Battery Description | Lithium | | Best Sellers Rank | #128,363 in Tools & Home Improvement (See Top 100 in Tools & Home Improvement) #96 in Post-Mount Mailboxes | | Brand | X-Sense | | Built In Media | 1 Smart Mailbox Alarm (Base Station Required) | | Color | Black | | Compatible Devices | Smartphone | | Control Method | App | | Customer Reviews | 4.3 4.3 out of 5 stars (159) 4.3 out of 5 stars | | Item Dimensions L X W X H | 3.91"L x 1.06"W x 1.02"H | | Item Type Name | Mailbox Alarm | | Manufacturer | X-SENSE | | Mfr Part Number | X-SENSE | | Model Number | SMA51 | | Mounting Type | Wall Mount | | Number Of Batteries | 1 CR2 batteries required. (included) | | Power Source | Battery Powered | | Sensor Technology | Infrared Sensor | | Size | Only 1 Alarm (Base Station Required) | ## Product Details - **Brand:** X-Sense - **Color:** Black - **Compatible Devices:** Smartphone - **Power Source:** Battery Powered - **Product Dimensions:** 3.91"L x 1.06"W x 1.02"H ## Images ![Smart Mailbox Alarm, Requires SBS50 Base Station, Wireless Long Range Mailbox Alert, Mailbox Sensor for Delivered Mail, SMA51 - Image 1](https://m.media-amazon.com/images/I/71d+6EvSzML.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Awesome covi *by on Reviewed in the United States March 9, 2025* The X-Sense Smart Mailbox Alarm System is a cutting-edge solution for anyone seeking a blend of convenience and security in managing their mail. With real-time push notifications delivered directly to your mobile device, you'll never miss a mail delivery again. Whether you use a curbside, wall-mounted, or cluster mailbox, this versatile system integrates effortlessly into various setups.One of its most impressive features is the long-distance transmission capability, ensuring a strong and reliable connection to the base station. This means you’ll receive timely alerts, even from a considerable distance. The system’s installation is refreshingly simple, requiring no wiring—just the included double-sided tape and user-friendly in-app guidance.Built to last, the X-Sense Mailbox Alarm boasts an IP65 waterproof rating and operates efficiently in extreme temperatures, from 14°F to 140°F. Its durable ASA shell and silicone seal protect against UV damage, guaranteeing longevity even in harsh weather conditions. The replaceable battery, designed to last up to four years with typical usage, further underscores its practicality.Additionally, the system supports multi-user sharing, allowing everyone in your household to stay informed. This thoughtful feature adds to its appeal for families or shared living arrangements.In summary, the X-Sense Smart Mailbox Alarm System combines durability, functionality, and ease of use. Its innovative design not only streamlines mail management but also provides peace of mind, making it a standout choice for modern households. ### ⭐⭐⭐⭐⭐ Great range, needs better adhesive and more customization *by on Reviewed in the United States August 16, 2024* Great range from the base station. My mailbox is over 500 feet away and the signal has to deal with my brick house. (It probably goes through a window but still...). My Wi-Fi doesn't reach the mailbox but the base station connects to the mailbox alarm with no problem.The unit consists of two parts. There's the sensor itself which detects light and houses a battery, and that clips on to a mounting bracket that you put on the inside of the door of your standard curb line mailbox. The mounting bracket is attached to the door with a peel and stick adhesive. Unfortunately that adhesive will not hold up to very hot temperatures particularly if your mailbox is in the sun. The temperature went above 90 and I started getting false alarms because the detector was sliding around and detecting subtle changes in light. This isn't hard to fix; you just need and adhesive that can withstand high temperatures. I reattached the mounting bracket with silicone sealant design for fireplace components. Definitely overkill but it was a cheap fix and it got the job done. I'm not sure if that sealant is designed to stand up to winter temperatures but I guess I'll find out in a few months. The bottom line is that you're going to have to think about how you attach the mounting bracket in your climate.The X-Sense app is good in the sense that it's easy to understand and it works. A lot of apps for these types of gizmos are terrible but overall I'm impressed with X-Sense. But it doesn't have much in the way of customization. And that means that whenever the mailbox is opened the alarm goes off. So you're triggering your own alarm every time you open the mailbox to get the mail. There should be a setting that allows the alarm to be triggered only once a day, or mutes it for a while after it initially goes off, or turns it off completely at certain times of day.But overall it works, and the one inconvenience that threatened its usefulness was solved with a higher quality adhesive. ### ⭐⭐⭐⭐⭐ A useful, convenient product. We recommend it. *by on Reviewed in the United States February 11, 2026* We bought this mailbox alarm at the same time we got water leak detectors from X-Sense. We bought the set of leak detectors without the base station and use the station included with the mailbox alarm for everything. It all works well together. We particularly like the fact that the mailbox alarm saves us making unnecessary trips out of the mailbox just to discover the mail has not yet been delivered. It also reduces the chance of mail theft. When the letter carrier opens the mailbox, we get a chime to notify us, so we can pick it up right away. Our mailbox is not too far away, but for anyone who has a long driveway or who lives in an apartment building, this would be a must have. Just remember to press the reset button on the base station after you’ve picked up the mail.Set up was easy. The only potential issue I could see is if your Wi-Fi is not strong enough to reach your mailbox, since it all works over your Wi-Fi system. ## Frequently Bought Together - X-Sense Smart Mailbox Alarm, Requires SBS50 Base Station, Wireless Long Range Mailbox Alert, Mailbox Sensor for Delivered Mail, SMA51 - X-Sense Smart Mailbox Alarm, Wireless Long Range Mailbox Alert, Mailbox Sensor with SBS50 Base Station for Delivered Mail, SMA11 - X-Sense Smart Home Security System, Wireless Home Alarm System 8-Piece Kit, Supports Mobile App Alerts, Compatible with Alexa, Includes 1 Base Station, 4 Door Sensors, 2 Motion Sensors, 1 Keypad, AS08 --- ## 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/625394282-smart-mailbox-alarm-requires-sbs50-base-station-wireless-long-range](https://www.desertcart.co.uk/products/625394282-smart-mailbox-alarm-requires-sbs50-base-station-wireless-long-range) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-07-31*