HTZSAFE Extra Plug-in Receiver for Wireless Alarms- Up to 32 Zones and 35 Optional Melodies- 4 Adjustable Volume Levels,Black

I originally got the package with 3 sensors and one receiver. Check out my full review with updates there. This system is so versatile that the only limit for it's usage is your imagination. I got this second sensor to go upstairs outside my bedroom in the hallway. The other is in the kitchen window as you can see in the picture. The video is what it looks like at night from out in the driveway. Between the two receivers they are loud enough to be heard anywhere in my home. The receiver in the kitchen window is only connected with one sensor. The receiver upstairs is connected to all of my sensors. My thought was that an intruder would see it and it would stop or slow them down. It did exactly that! See my update in my original review. The directions for setup are easy to follow and you can also find videos online should you need further help. This system is great for letting you know when you have visitors or intruders. With so many different alarm sounds to choose from, it is easily set up so you can know exactly where someone is on your property. This system not only met my expectations, it exceeded them. Again please, check out my original review. You will not be disappointed.

Works great! Easy to use. Volume is loud we have no trouble hearing it. Would buy again.

These work well. They do pick up the deer going by, so I do wake up at night. But easy to install and use.

Extra plug in receiver for Owl door bell has about 35 different sounds. I use it for call bell for my son.

They work well. Placed them on property line north, south, east, west. Plus an extra receiver for my bedroom.