Received this kit, charged up the monitor and put batteries in the "gun" part. It worked really well while I tested it initially. The next day when I went to turn it on to use it, it wouldn't come on. Charged the monitor some more. It still wouldn't work. The next day I tried it again and it turned on! So I took it to my job site and turned it on and guess what... it won't turn on again. It has been doing this for 5 days in a row now. Seems like the monitor turns on whenever IT feels like it. I will be returning it.