Aetertek AT-219 New Version 600 Yard Remote Control Dog Training Collar Shock Vibration Auto Anti-bark for 1 Large Dog 100% waterproof and submersible desigh Intelligent 18 levels of progressive shock corrections(both in shock time and voltage) to correct bad behaviors effectively. Latest individual design ,novel in appearance. Rechargeable transmitter and receiver. Can be used manually as a remote dog trainer or as an automatic anti-bark/bark control collar