The DT Systems Bark Boss RECHARGEABLE No-Bark trainer from DT Systems is the perfect solution to help train your dog to stop unwanted barking. The collar can be programmed for a beeping Tone only, or a beeping Tone warning with the e-Stim shortly following. Perfect for smaller dogs Compact, waterproof with 8 fully adjustable levels of Gentle Touch static stimulation Specially designed vibration sensor picks up vocal cord vibrations and not other loud noises Audible Tone/Beep with option for tone warning then stimulation Uses rechargeable battery (included) Easily adjustable buckle type collar strap adjusts from 7 to 27