topPets Rechargeable Waterproof Dog Training Collar, Use for Training and Bark Control, Shock, Vibration, and Audio Tone. Fits Small Medium and Large Dogs. Remote dog training collar with advanced RF technology, boosts range up to 450 yards. Rechargeable battery in both the transmitter and receiver with waterproof receiver collar. 16 Levels of stimulation and vibration. Individual stimulation, vibration and tone only button. Easy to read digital remote transmitter with blue back lighting. User expandable to a two-dog system. The remote control and the receiver had been paired before packaged. You just need to turn on the receiver and the remote, the training system will work for you. Dog E-collar fits all dogs. From 25 to 100 lbs with a TPU collar size from 11 to 22 inches long