Innotek's Rechargable Automatic No-Bark Dog Collar is incredibly easy-to-use, with no external controls or settings to hassle with. The BC-200 collar features an ultra compact collar, is 100% waterproof, and is powered by a rechargeable NiMH battery. Helps your dog teach himself to remain quiet. Activated only by your dog's bark. Easy-to-use, no external controls or settings to configure.