The Radio Systems PDT00-12892 VT-1 Vibration Trainer offers you a new way to communicate with your dog. Suitable for dogs weighing 8 pounds and up, this trainer ranges up to half-a-mile, with 15 levels of adjustable vibration corrections. When you push the button on the remote transmitter, the emitted signal is received by the receiver collar. In response, the collar vibrates and alerts your dog. This method can be used to warn about misbehavior or teach standard commands.