Aetertek AT-215D Rechargeable 600 Yard Remote 2 Dogs Pet Vibration Electric Shock Trainer Training Collar Used as 1 dog or 2 dogs remote dog training collar system (This list is for 2 dogs with 2 receivers ) Shock + Beep + Vibration to get your dog's attention. Respond quickly, and can keep working until you release the function button. It is easy for user to build up a series training command through combined three corrections and duration time. Solid remote working range up to 600 yards (550m), suitable for all dog size from 15-150lbs Aetertek collar use the most advanced design, electromagnetic induction switch solution, on the power ON/OFF switch to ensure unlimited accurate switch, more convenient and reliable. . Avoid the unstable, ageing and mechanical damage for waterproof structure, to ensure the collar with excellent waterproof performance. Rechargeable and waterproof receiver collar. Aetertek receivers DC base adopt embedded injection molding process, and equipped with high-precision-waterproof ring with built-in guide slot , ensured waterproof effect over 3 hours underwater 50cm.