X-Sense Smart Mailbox Alarm for Delivered Mail, APP Alerts

Mailbox sensor is approximately 500’ away, with dense woods in between. Easy to install and worked immediately, the iPhone app is great. It is great to have the notifications because our rural delivery is subject to varying times and this saves me going out multiple times, will be wonderful during rain and snow periods.

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

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.

This thing works great. My neighborhood has those groups of mailboxes with keys down the street, straight line distance is maybe 1/4 mile, I put the receiver upstairs and the sending unit inside the door of the metal mailbox. It's pretty consistent about getting the notification that I got mail, so no wasted trips as it's a 7 minute walk or so.

Their latest Big Update Fixed alot of the problems and issues i had with this product. I like how now i can set it up to my privacy likings. Can set it up only Alert sounding 1 time on the base , and can adjust the volume. And no everyday notifications on my emails or texts. And can turn off for continuous alert sounding , and you dont have to Silence the Base Alert everytime by going and pressing that base button. The Only thing i soo wish that we could do , is put our own Custom MP3 sound in it. Have few Alert sounds , and can add a few of your own. My consern before was , if the Alert keeps Sounding off , and wont stop , imagine catches on to this and uses it opening your Mailbox to make the Alert go off and if no one turns it off and it keeps Sounding off ... that means No one is Home. That was my Big Concern, and they Fixed it !! Because you could be Driving , or cellphone is turned off or dead , and not knowing whats happening at home. The Update Fixed Them

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.

Works as advertised, but my mailbox isn't very far and I placed the receiver by a window on the same side of the house so I can't speak about its range or ability to receive through walls. Setup was fairly straightforward. Will see how the battery lasts / how it holds up in the summer heat.

The paper instructions are a bit confusing, as well as difficult to read (very small text for my 63 year old eyes. I needed a reading magnifying glass along with my 1.5+ reading glasses. Better to follow the steps on the phone app. My drop box is about 100ft from my house. The base unit connected quickly with my WiFi router so I know that part is working correctly. I placed the base unit in my front window in sight of my mailbox. I have yet to mount the mailbox unit in the mailbox. Testing shows the base is receiving the signal from it when triggered. If after mounting the mailbox unit, I find it to be unreliable, I will update this review with that information. So far, so good. Hopefully this will prevent me from missing a delivery or going out several times a day looking for a delivery that hasn't arrived yet.

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.