Aetertek Upgrade At-918c 100% Waterproof 2 Dogs Training Shock Collar 600 Yard Auto Anti Bark Function Rechargeable Upgrade AT-918C,better quality,more effective 600 yards (550m) remote control range,rechargeable remote and receiver,save money on buying replacement battery. Adjustable 9 levels for shock correction, beep and vibration function. 100% receiver (genuine waterproof). Auto anti bark feature New electromagnetic induction way to Turn on /off the device ,more convenience