HENDUN Motion Sensor Doorbell , Bed Alarms for Elderly Dementia Patients , Door Chime for Business, Store Welcome Buzzer Monitor , Fall Detection Alarm for Seniors , Caregiver Reminder for Elderly

works great. i use 2 separate devices this is one.. motion detection on a door.. along with a magnetic switch sensor. can't have old old old people wandering off in the middle of the night and freezing to death or getting lost.

I bought this unit for use as a motion activated doorbell for my store as the one we had was way too quiet to be effective. The unit was easy to install and works perfectly; it's a great value at under $30. The chime unit can be free standing or mounted. The motion sensor can be mounted with mounting tape or screws (included) upside down sideways and has an adjustable bracket. I recommend using screws instead of the mounting tape included as the mounting tape is the standard two sided white foam type that will eventually dry up after a few years and sensor may fall. If you don't want to use screws, I would recommend you buy some 3M auto molding tape which seems to last forever and is very hard to remove. The sensor and transmitter range is fantastic and I had no trouble in my store with it (supposedly it has the range of up to just over the length of 3 football fields). I initially just put batteries in the chime and motion sensor after unboxing and installed them. The default setting is a motion activated door chime that is a loud ding dong ding dong. I did not realize that the unit had a host of other tones, features, voice you can program using the 4 buttons on the unit. I found the programming to be a bit tricky and for my use, the other features are overkill since I just needed it as a motion activated door chime. After messing with it, I found out that it has 4 volume settings. The default setting is set at the LOUDEST setting which is great for some uses. For my roughly 10,000 SQ FT store, the second volume setting is adequate if you do not have any background music playing.

This little thing is worth it's weight to me. My husband is a quiet guy and has come in from outside more than once while I was at my desk and accidentally scared the crap out of me because I thought I was alone in the house. It really works and the best part is you can set it for a fairly loud alarm, but I didn't want to scare both of us! Lol I found out you can set it to just have lights flash and it's perfect! They get my attention and saved my sanity!

I mounted two of these on each frame of two different garage doors. One of the garage doors is almost 300 feet from where the receiver is located. Works every time. Bad news... it rings when the garage door goes up... rings again when I enter the garage to get into the car...rings again when my car is pulling out..and rings one more time...when the door goes down. You will har the alarm..four times. BUT... it does work so far... and it is priced nicely...worth the purchase.

Works great for the office

My cat sometimes wants to go out right at bedtime. I can now go to bed and when it rings it wakes me up to let him back in. I used to just check if I woke up during the night. Or he would stay out all night. 😿 This is perfect, he now has his own doorbell.

The device works just fine under the right conditions. However, some of it's claims are simply not true. The reason this “Motion Sensor” doesn’t work inside a mailbox isn’t because of it’s signal being blocked by metal or due to distance to receiver. It’s because it is not a “motion” sensor. It is in fact a “heat” sensor. A heat sensor reacts to an increase in the heat detected from anything higher than the ambient temperature in the area. The heat generated inside a mailbox is higher than the outside air. So opening the box doesn’t trigger the sensor. It’s the same problem affecting some Smart Doorbells. To prove this fact I conducted a simple experiment. I placed the sensor inside a metal mailbox. The sensor never activated no matter where I placed it inside the box. I then place a couple of ice packs from the freezer in the box with the sensor. After a few minutes the sensor activated every time I opened the mailbox door. Calling these devices “Motion” sensors is very misleading, and their limitations should be clearly explained by the manufacturers.

Used this to keep to train a cat where not to be (switched the Greeting to Chinese from hellish sounds more nosier and is loud at at full volume. If I am around and hear the alarm I also say GET! sternly. The first two weeks they tested it several times first 3 or 4 days then about Once every two days after two or three weeks. 3 months later they understand the perimeter that will set it off and may walk up to the edge. If I had to Guess they are trying to think how to defeat it momentarily and walk away. Best gadget Repurpose Ever.

C’est fiable et prévient le vol près des portes d’entrées. Il est en fonction depuis 2 1/2 ans sans problème. Nous avons branché le tout sur ports USB. Très fiable. Je recommande

Facile a placer

Habe wegen meine Katze gekauft. Funktioniert einwandfrei und gut.

Tiene muy buen volumen (ajustable) y buen alcance entre ambos puntos. *Salvo que usa pilas y no es eléctrico.

Benutzen es als "Katzenglocke". Wenn erstmal weiß, wie, ist es einfach, nur Licht oder Ton plus Licht einzustellen. Funktioniert zuverlässig und meldet, wenn unsere Katze vor der Tür sitzt und rein möchte. Haben zwei davon.