3 Training Modes & Security Switch : provides 3 Safe effective humane training modes. Customized static shock (1-16) levels, vibration levels, standard “Tone” mode. The security switch prevents any misoperation on the remote. Feel free to carry the remote without worrying about the accidental shock 2 Channels Maximum Control & Longer Remote Control Range : If you want to train two dogs through one remote, PATPET can meet your needs. Up to 3000 Ft that allows you to train your pet easily both indoors and outdoors 2 Hour Quick Charge & Longer Battery Life : After 2-hour fully charging, the receiver collar is able to work 30 days and the remote is able to work 60 days. Low battery display on both remote and receiver reminds you charging time in advance Comfortable for All Sizes of Dogs : The adjustable nylon collar fits dogs with neck sizes 7\" - 27\". Stronger and smaller collar, Perfect for all size dogs (8 lbs~100 lbs), even puppies fit perfectly IPX7 Waterproof Technology : If your dog likes to play with water? Don\'t worry, The IPX7 waterproof collar stays in a water depth of 3.2 Ft for half an hour, and its performance is not affected. So your dog can enjoy chasing toys around a pool, or playing in the rain freely