Review on PATPET P320 Dog Training Collar: Remote Shock Collar for 2 Dogs, 3 Training Modes, Beep, Vibration, Shock, 1000 ft Range, Waterproof - Small Medium Large Dogs by Tracy Erickson

I really like these collars for my two dogs. They responded quickly and I very rarely have to use electric shocks. They respond to both a sound signal and vibrations. The only thing I found difficult is that you have to switch between the dogs. If you're not careful, you can easily signal the wrong collar if the wrong dog is selected. I'd like separate button sets for dog 1 and dog 2. Also, the remote goes into sleep mode. In order for you to "wake him up" you need to choose a team. I usually click the beep, but most of the time it sends a beep, but you can't see which dog is selected first. So if you want to shock first, you might shock the wrong dog. It would also help if the eject button was a different color and didn't mix with the other three buttons. Dogs generally respond to this collar. very good.