Lost or broke the remote for your X800 dog training collar? This is a replacement remote transmitter designed to work specifically with the X800 receiver collar system. Please note: This is ONLY the remote. It will NOT work with any other brand or model of dog collar. It's also NOT compatible with the X800S or X800 Pro models – just the standard X800. If your dog still has the receiver collar (the part with the prongs that goes on the dog's neck), this remote should pair with it to restore function. A simple and affordable fix to get your training system back up and running without buying a whole new kit.