X-Sense Smart Mailbox Alarm, Wireless Long Distance Mailbox Alert, Mailbox Sensor with SBS50 Base Station for Worried Mail, SMA11

The X-Sense mailbox alarm SMA11 which includes the SBS50 base station and the SMA51 sensor works brilliantly. The sensor is small, relatively unobtrusive, and is built for outdoor use. It has an IP65 rating and UV‑resistant housing so it will stand up to rain and sun without looking bulky. The package includes a mounting bracket for the sensor and 2 pieces (1 spare) double‑sided tape for quick installation to your mailbox. The sensor detection combines an infrared sensor and a tilt/motion trigger. I have found that it gives fast, accurate alerts for my parcel letterbox and most likely for most mailbox types. The base station will sound an alarm of your choice from 7 preset alert tones on the base station and you'll get a push notification to your phone the moment the mail flap or mailbox is opened. Range will depend on placement of the SBS50 base station but X‑Sense advertises long‑range transmission suitable for typical suburban setups. The SMA51 sensor (that attaches to your letterbox door/mail flap/parcel door of the letterbox) uses a replaceable CR2 lithium battery and X‑Sense estimates that you'll get about four years of standby life based on approximately 5 triggers per day. Now I find that that excellent and makes for a very low‑maintenance sensor. The X-Sense home security app is fairly straightforward to use and it is from here that you can change alert tones and control the volume (up to 100 dB on the base station). You can share alerts with multiple other users/family members by adding in email addresses, they then get an invitation for which they will need to accept in order to share alerts. You can change device names and clear any alerts from the app or directly from the base station. Just be mindful that this device will not pair directly with your phone you will need the SBS50 base station unless you already have one or buy the kit. My installation is in an all steel bricked in parcel letterbox and the signal has no issue reaching the base station. I am extremely pleased with the operation of the X-Sense Mailbox Alarm so far. In my case I installed the sensor on the inside of the mail flap of the parcel letterbox and it works equally as good when I get mail or when I get a parcel.

I'm quite honestly surprised at how well this works. It's set up approximately 70 feet from the base station going through 2 walls and a metal mailbox surrounded by brick. After a little over a year: Very few missed notifications or false alarms Only 1 battery change Nearly instant notifications on both the base station and app (Android) Configurable base station alarm options (tones, volume, reminder frequency) Useful and inexpensive expansion options I've tried 2 other mailbox monitoring solutions and both were more expensive, less attractive, had shorter range, and were much less reliable. As with all consumer level wireless/IoT equipment (regardless of country of origin), for security reasons, I'd highly suggest putting this on a guest or internet access only wireless network.

UPDATE 7/15/2026 ********** My issue with the company is you made it so difficult for him to try to prove he had a faulty product that he just decided to do what was easiest for him. I would’ve done the same thing if I had the same issues. Below is his comment. I just wanted you to know you may find a better way, like maybe replace it rather than work with a faulty item. Mine worked fine but there’s 300 people I recommended this to That,. I hope it works like it did for me. BELOW IS WHAT MY HOA MEMBER had difficulty with this mailbox alarm….. “I'm having a really difficult time getting my X-Sense mailbox system to install. I've contacted X-Sense for technical help. The app won't let me scan the QR code on the base station and when I enter the serial number it goes nowhere. 20 minutes ago I intered the S/N and the phone is still on the entry screen. Frustrating.” “I contacted technical help via their web site” “I got a reply from X Sense with some instructions. I followed them and was still unsuccessful. The last instruction was, "If the issue still cannot be resolved, please send us a short video showing the setup process and where the app gets stuck or goes back." I'm not going to do that. I'm going to return the system and go with a different one.” “I got a reply from X Sense with some instructions. I followed them and was still unsuccessful. The last instruction was, "If the issue still cannot be resolved, please send us a short video showing the setup process and where the app gets stuck or goes back." I'm not going to do that. I'm going to return the system and go with a different one.” ********************* January 20, 2026 One of the best purchases I ever made was this mailbox alarm. That only does it alert you when the mail door is open and they’re putting mail in, it will tell you if someone opens it after the mails come and steals it. The alarm goes off on your smart phone if you’re away from the house. If you’re in the house, there are several Sounds. You can use to let you know the mail has come. It also has a blue X if there has been no mail. And there’s a red X if the mailbox door has been opened. Your smartphone also keeps a history of when the mailbox door has been opened. If you live in a rural area & worry about male theft. This is exactly what you need. Don’t forget to put up a camera that will also get a picture of when the door has been opened. I have recommended this to many neighbors in my community. It’s the best thing for your money, it’s long range and the battery lasts for a very long time. 1/20/2026

Very happy with this X-Sense smart mailbox alarm! Setup was an absolute breeze—I had it paired to the SBS50 base station via the app and mounted inside my curbside mailbox with the included double-sided tape in less than five minutes. Here is what makes this device standout: Instant, Reliable Alerts: The real-time push notifications hit my phone the exact second the mailbox flap opens. No more walking down a long driveway in bad weather just to check an empty box! Impressive Range & Base Station: The 2.4 GHz signal easily reaches my mailbox from inside the house without dropping connection. Plus, the base station is loud (up to 100 dB) with customizable chimes so I can hear it anywhere indoors. Built to Last: The IP65 weatherproofing and UV-resistant shell have handled heat and rain like a champ without fading or glitching. Knowing the battery lasts up to 4 years gives me total peace of mind. App Features: Multi-user sharing allows my whole family to get alerts, and I love being able to expand the system with up to 50 other X-Sense security devices down the road. If you’re looking for a simple, reliable way to track your mail deliveries in real time, this device is worth every penny. Highly recommended!

I haven't had any problems with this alarm system. It is nice to know for when the mail has been delivered. The selection of alarm sounds are good; some are funny (e.g. a dog barking). There is even a volume control for the alarm. There is an app for the phone that notifies you when away from home that the mail has been delivered. it was easy to establish wifi connections. I have no complaints.