DT Systems Bark Collar Trainer - Ultra Min-e 2090 - 100% Waterproof - Designed for Smaller dogs, Lightweight and Compact Design. Bonus FREE 6 Volt Battery No-Bark trainer with 8 levels of intensity for extra small to large dogs. 100% Waterproof, Lightweight, compact collar unit (dog can wear while wet). 8 Adjustable levels of static stimulation. Specially designed vibration sensor picks up vocal cord vibrations so it won't be activated by other dogs' barking. User Adjustable for low level Gentle Touch Stimulation (fine tune for your dog's needs).