The 190 DT No-Bark Trainer is a safe and effective tool to help eliminate any excessive or unnecessary barking from your dog. This automatic trainer has 9 levels of intensity for sensitive to stubborn dogs. The collar unit is waterproof and uses a regular 9V battery. Key Features: Digital Technology. Waterproof collar. Specially designed vibration sensor picks up vocal cord vibrations so it wont be activated by other dogs barking. 9 intensity levels. Gentle Touch Stimulation with lower levels. 1/2 second corrective stimulation. 4 second safety delay. Fits medium to extra large dogs. Package Contents: 1 x Collar Unit. Test Light. Instruction Manual.