Aetertek At-211w-1 Dog Shock Collar 400 Yard Remote Control Dog Trainer 1 Dog Training Water-resistant Shock Collar Can be used for 1 dog and 2 dogs training system, this listing is for 1 dog training Solid 350M (400Yards) remote range, fit dogs from 6 lbs to 50 lbs with a receiver neck size from 2" to 9" long Beep tone function + vibration correction + 10 Levels of progressive shocks Water-resistant dog shock collar, pls DO NOT make your dog swim with it Dog trainer CE & ROHS approved