This item works best with one sensor per one receiver

All the sensors which are paired to just one receiver work fine.

Good selection of sounds some short some long

After return window went out unit stopped working at 50' distance and has now started working again.

Happy overall with the customer service received and would recommend to anyone looking for a cheap way to know someone walks through the door while your in another part of the office.

Good quality and easy to use

Now i feel safer sleeping in my house because i can hear if someone enters In there.

It might have a dud because mine only works about 20 feet.

It might have a dud because mine only works about 20 feet.

And the instructions are clear too.

Only thing is it goes off as soon as you open the door when it's turned on - maybe a 2 second delay would give you time to turn it off before it sounded - but overall worth the money as an easy deterrent.