--- product_id: 599552438 title: "Smart Mailbox Alarm, Wireless Long Range Mailbox Alert, Mailbox Sensor with SBS50 Base Station for Delivered Mail, SMA11" brand: "x-sense" price: "£33.59" currency: GBP in_stock: true reviews_count: 9 category: "X Sense" url: https://www.desertcart.co.uk/products/599552438-smart-mailbox-alarm-wireless-long-range-mailbox-alert-mailbox-sensor store_origin: GB region: Great Britain --- # 50m long-range wireless 4-year battery life IP65 waterproof durability Smart Mailbox Alarm, Wireless Long Range Mailbox Alert, Mailbox Sensor with SBS50 Base Station for Delivered Mail, SMA11 **Brand:** x-sense **Price:** £33.59 **Availability:** ✅ In Stock ## Summary > 📬 Never miss a delivery again — smart alerts for the savvy professional. ## Quick Answers - **What is this?** Smart Mailbox Alarm, Wireless Long Range Mailbox Alert, Mailbox Sensor with SBS50 Base Station for Delivered Mail, SMA11 by x-sense - **How much does it cost?** £33.59 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/599552438-smart-mailbox-alarm-wireless-long-range-mailbox-alert-mailbox-sensor) ## 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 the Elements:** IP65-rated waterproof casing and UV-resistant shell ensure reliable performance rain or shine. - • **Effortless, Wire-Free Setup:** 100% wireless design with easy double-sided tape installation—get started in minutes without tools. - • **Seamless Multi-User Sharing:** Share mailbox status with family or colleagues via the intuitive X-Sense app for ultimate convenience. - • **Customizable Alarm Experience:** Choose from 7 ringtones and adjust volume up to 100 dB to match your style and environment. - • **Instant Mail Alerts, Anywhere:** Real-time push notifications keep you effortlessly in the loop, no matter where you are. ## Overview The X-Sense Smart Mailbox Alarm SMA11 offers a cutting-edge wireless mailbox sensor with a 50-meter range, 4-year battery life, and IP65 waterproof rating. Compatible with 2.4 GHz Wi-Fi and the X-Sense Home Security App, it delivers instant push notifications and multi-user sharing. Its sleek, wire-free design fits various mailbox types and provides customizable alerts up to 100 dB, making it the ultimate smart home upgrade for busy professionals who value security and convenience. ## Description desertcart.com: X-Sense Smart Mailbox Alarm, Wireless Long Range Mailbox Alert, Mailbox Sensor with SBS50 Base Station for Delivered Mail, SMA11 : Tools & Home Improvement Review: Great product for Mail Delivery - I installed this on my mailbox yesterday and was absolutely thrilled to find how well it works. I had no problem installing it as the instruction were clear and prompted you on the App through each step. It would have been easier as a two man job but I was able to do it all by myself and I am 71 years old!! My mailman comes all different times so this was a must for me as I was running out to the mailbox all day to find he had not yet arrived. Now I know exactly when my mail has been delivered. Great Product. Review: Better than Ring Mailbox Sensor, Working Great at 100' - According to Google Maps, the sensor and base station are 100' from each other, though it's probably a little less (I did some manual measuring but did not want to run my reel tape across the street). Please see the associated picture for my setup. The base station is in my garage on large, cluttered steel shelving, and we have a metal garage door and stucco exterior. The mailbox is also metal, and although the company recommends installing the sensor on the outside of a metal mailbox, that's unreasonable if you think someone might be stealing your mail since they could just slide the sensor right off. So I installed it inside the mailbox. Part of the reason I got the sensor was neighbors complaining about their mail being stolen, but using "USPS Informed Delivery" I can see what I am expecting each day, and an alert from this sensor lets me grab the mail as soon as it arrives if I'm home. It's only been installed a few days but so far it has worked 100% of the time (as confirmed by my own testing and Ring cameras which snapshot every 30 seconds). My mailbox was here when we moved in, and it's a bit unusual. It has a swinging top portion and a locked lower portion. When the mail is delivered, the top portion opens enough that mail can come in, but not your hand, since there is a metal guard that also flips up. I installed the sensor on the lower, inside portion of the metal flap, so it does not block mail delivery (again, see photos), but that means there is always one or two layers of metal between the sensor and the outside which I was afraid would block the signal. In fact, I previously purchased a Ring mailbox sensor that never successfully alerted me to any mail. It triggered in a few tests, but was never reliable inside the box despite the huge antenna. One reason I bought the X-Sense was the separate base station, which could be closer to the mailbox than the Ring Bridge. Ring only lets you have one Bridge, and moving it to the front corner of the garage sacrificed the connection to the lights at the back of our property and still didn't detect the mail. Now the Ring Bridge is in the back of the house, and the X-Sense Base Station is in the Garage. The Ring Sensor might have theoretically been able to trigger cameras that would record who was accessing the mailbox, but since it never worked at all, it was a moot point. On sale, these units cost about the same (even with the X-Sense base station included). The X-Sense is also smaller and easier to install as well as being more effective and reliable. Contrary to another recent review, the app definitely works on Android. I am using a Pixel 6a (2.5yrs old at the time of my review) and it has no issues. Perhaps the other reviewer had a phone that was limited to an out of date Android OS. I am on Android 15. All in all, 5 stars! It even came with two adhesive pads for the backer. My only gripe is that has a two minute delay after triggering before it will trigger again, and I'd like to be able to adjust that timer, but I understand the reasoning. ## Features - Note: Compatible only with 2.4 GHz Wi-Fi (incompatible with 5.0 GHz); connects to the X-Sense Home Security App via the included base station - 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 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 - Customize Your Home Safety System: Includes 1 mailbox alarm and 1 SBS50 base station; each base station can add 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 ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0CPLQ16K7 | | Audible Noise | 100 Decibels | | Battery Description | Lithium | | Best Sellers Rank | #23,402 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #27 in Post-Mount Mailboxes | | Brand | X-Sense | | Built-In Media | 1 X Smart Mailbox Alarm, 1 X SBS50 Base Station, 1 X User Manual | | Color | Black | | Compatible Devices | Smartphone | | Control Method | App | | Customer Reviews | 4.3 4.3 out of 5 stars (1,449) | | Item Dimensions L x W x H | 3.91"L x 1.02"W x 1.06"H | | Item Type Name | mailbox alarm | | Manufacturer | X-SENSE | | Maximum Range | 50 Meters | | Mounting Type | Protruding | | Number of Batteries | 1 CR2 batteries required. (included) | | Power Source | Battery Powered | | Sensor Technology | Infrared Sensor | | UPC | 850053675409 | | Voltage | 3 Volts | ## Product Details - **Brand:** X-Sense - **Color:** Black - **Compatible Devices:** Smartphone - **Power Source:** Battery Powered - **Product Dimensions:** 3.91"L x 1.02"W x 1.06"H ## Images ![Smart Mailbox Alarm, Wireless Long Range Mailbox Alert, Mailbox Sensor with SBS50 Base Station for Delivered Mail, SMA11 - Image 1](https://m.media-amazon.com/images/I/61JsrJVrxqL.jpg) ## Available Options This product comes in different **Style** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Great product for Mail Delivery *by R***T on April 3, 2026* I installed this on my mailbox yesterday and was absolutely thrilled to find how well it works. I had no problem installing it as the instruction were clear and prompted you on the App through each step. It would have been easier as a two man job but I was able to do it all by myself and I am 71 years old!! My mailman comes all different times so this was a must for me as I was running out to the mailbox all day to find he had not yet arrived. Now I know exactly when my mail has been delivered. Great Product. ### ⭐⭐⭐⭐⭐ Better than Ring Mailbox Sensor, Working Great at 100' *by J***W on January 11, 2025* According to Google Maps, the sensor and base station are 100' from each other, though it's probably a little less (I did some manual measuring but did not want to run my reel tape across the street). Please see the associated picture for my setup. The base station is in my garage on large, cluttered steel shelving, and we have a metal garage door and stucco exterior. The mailbox is also metal, and although the company recommends installing the sensor on the outside of a metal mailbox, that's unreasonable if you think someone might be stealing your mail since they could just slide the sensor right off. So I installed it inside the mailbox. Part of the reason I got the sensor was neighbors complaining about their mail being stolen, but using "USPS Informed Delivery" I can see what I am expecting each day, and an alert from this sensor lets me grab the mail as soon as it arrives if I'm home. It's only been installed a few days but so far it has worked 100% of the time (as confirmed by my own testing and Ring cameras which snapshot every 30 seconds). My mailbox was here when we moved in, and it's a bit unusual. It has a swinging top portion and a locked lower portion. When the mail is delivered, the top portion opens enough that mail can come in, but not your hand, since there is a metal guard that also flips up. I installed the sensor on the lower, inside portion of the metal flap, so it does not block mail delivery (again, see photos), but that means there is always one or two layers of metal between the sensor and the outside which I was afraid would block the signal. In fact, I previously purchased a Ring mailbox sensor that never successfully alerted me to any mail. It triggered in a few tests, but was never reliable inside the box despite the huge antenna. One reason I bought the X-Sense was the separate base station, which could be closer to the mailbox than the Ring Bridge. Ring only lets you have one Bridge, and moving it to the front corner of the garage sacrificed the connection to the lights at the back of our property and still didn't detect the mail. Now the Ring Bridge is in the back of the house, and the X-Sense Base Station is in the Garage. The Ring Sensor might have theoretically been able to trigger cameras that would record who was accessing the mailbox, but since it never worked at all, it was a moot point. On sale, these units cost about the same (even with the X-Sense base station included). The X-Sense is also smaller and easier to install as well as being more effective and reliable. Contrary to another recent review, the app definitely works on Android. I am using a Pixel 6a (2.5yrs old at the time of my review) and it has no issues. Perhaps the other reviewer had a phone that was limited to an out of date Android OS. I am on Android 15. All in all, 5 stars! It even came with two adhesive pads for the backer. My only gripe is that has a two minute delay after triggering before it will trigger again, and I'd like to be able to adjust that timer, but I understand the reasoning. ### ⭐⭐⭐⭐⭐ I would buy it again *by J***N on January 20, 2026* t’s great to find a very useful item at a great price and this mailbox alarm is no exception. Our mail box is about 50 to 60 feet away, with a slight bend in the line of sight and a tree and brick wall in the way. Today the temp is 13 deg Fahrenheit and it worked like a charm. The base unit is in the entryway and has a green x on top when set. The x turns red when triggered and is reset by pressing a button on the back of the base unit. Battery life is stated to be about 4 years and is replaceable. Installation and setup is very easy. The unit emits a tone and the red x flashes when the mailbox door in opened. The ring tone can be changed with 5 different tones. There is also an app that notifies you even when away. My only suggestion (not complaint) would be to allow reseting the unit from the app. This would be great if I couldn’t get to the base unit to reset it if I was away or another part of the house. If necessary I would buy this mailbox alarm again. ## Frequently Bought Together - X-Sense Smart Mailbox Alarm, Wireless Long Range Mailbox Alert, Mailbox Sensor with SBS50 Base Station for Delivered Mail, SMA11 - X-Sense Smart Mailbox Alarm, Requires SBS50 Base Station, Wireless Long Range Mailbox Alert, Mailbox Sensor for Delivered Mail, SMA51 - 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/599552438-smart-mailbox-alarm-wireless-long-range-mailbox-alert-mailbox-sensor](https://www.desertcart.co.uk/products/599552438-smart-mailbox-alarm-wireless-long-range-mailbox-alert-mailbox-sensor) --- *Product available on Desertcart Great Britain* *Store origin: GB* *Last updated: 2026-04-23*