Aetertek AT-219L LCD Display Rechargeable 100% Waterproof 2 Dogs Training Collars For Large Dog With Remote 600 Yard Auto Anti-bark Feture 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