Aetertek At-216w-2 3-in-1 Multi-functional Dog Shock Collar with Beep Vibration Shock Collar, 600 Yard Remote Control Dog Training Electric Shock Collar, Water-resistant Bark Collar for 2 Dogs Anti Bark Collar Control your dogs at the same time or individually, this list is for 2 dogs training, upgrade it by adding extra receivers Rechargeable water-resistant (not waterproof) receiver collar, pls DO NOT make your dog swim with it Adjustable strap fits 6-25"/15cm-65cm neck size, suitable for all dog size from 15-150lbs Classic dog bark collar with great performance: strong Vibration, Beep and 0-7 adjustable level of Shock correction mode Remote range up to 600 yard (approx. 550 meter), signal can pass through fens or walls