Aetertek At-211sw 1 Dog Training Collar 400 Yard Remote Control Shock Collar Rechargeable Dog Trainer Small Dog 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 + vibration + 10 Levels of progressive shocks, LCD display to show do selection, sleep mode for long battery life Water-resistant dog shock collar, pls DO NOT make your dog swim with it Small dog collar, even suitable for your cute cat pet