Aetertek At-211D Water Resistant Dog Training Collar Rechargeable Shock Collar 1 Dog Trainer 350m Remote Control Dog Electric Shock Collar As 1 dog training, add extra collar to upgrade 2 dogs trainer Solid 350M (400Yards) remote range, fit dogs from 6 lbs to 50 lbs with a receiver neck size from 2" to 9" long Beep + vibration + 10 Levels of progressive shocks, LCD display + remote sleep mode for long battery life Submersible dog trainer, can be immersed in water when swim Dog trainer CE & ROHS approved. 1 year warranty