The Ultra Min-e 2090 No-Bark Trainer is a safe and effective tool to help eliminate any excessiveor unnecessary barking from your dog. This automatic trainer has 8 levels of intensity for sensitiveto stubborn dogs. The collar unit is waterproof.Features:* Digital Technology* Lightweight waterproof collar* Specially designed vibration sensor picks up vocal cord vibrations so it won't be activated by other dogs' barking.* 8 intensity levels* Gentle Touch Stimulation with lower levels* 1/2 second corrective stimulation.* Fits small to large dogs.Package Contents:* 1 x Collar Unit* Test Light* 6V Battery* Extra Contacts and Sensor* Instruction Manual