Aetertek AT-216W 600 Yard Remote Range Rechargeable Pet System Dog Training Electric Shock Collar Water-resistant For 1 Dog Updated 216D with better quality and appearance. Used as 1-1 remote dog training shock collars (need extra receiver if for 2 or 3 dogs training system) Vibration, Beep and 0-7 adjustable level of Shock correction mode. Use electromagnetic induction switch solution, on the power ON/OFF switch to ensure unlimited accurate switch, more convenient and reliable. Rechargeable and water proof receiver. Legally use the 915 MHz frequency segment. 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. Remote range up to 600 yard (approx. 550 meter), suitable for all dog size from 15-150lbs. Gold-plated antenna pedestal and charging head, with outstanding signal emitted characteristic, color will not fade, never oxidized. CE,ROHS,FCC Approved. 1 Year warranty