Homdox 1100 Yards Water Proof Rechargeable Adjustable Pet Training Collars Water Resistant Dog Training Collar Adjustable E Collar with Wireless Remote Rechargeable and waterproof dog training collar. Both transmitter and collar receiver can be charged at the same time, save your time. 1100 Yards Backlight Screen Remote Transmitter control electric dog shock collar with 3 modes: shock, vibration, sound. Includes two collar, Remote Transmitter can control up to two dogs. Lithium battery, can be full of electricity for 3 hours. Full power can be used for 15 days, depending on the frequency of use. Fully waterproof receiver,Receiver can waterproof within 10 meters.Dog E-collar fits all dogs from 15 to 100 lbs and collar sizes range up to 28.5 inches. With a belt-clip on the back of the remote control for easy carrying on. Adjust the collar to fit your dog's neck. The proper tightness should be that you can insert a finger in between. Rechargeable and power saving design, auto sleep mode to conserve battery life. Attention:We suggest customer use low(level one) level shock on medium or large breed first; Obstacles will affect the valid distance of remote controlling.