Simple and Easy Operation - The training collar has separate buttons for sound, vibration, light and high-low, allowing you to directly choose the training mode that suits you. You can quickly switch without confusing the complexities 4 Working Modes and 3 Channels - The device has 4 working modes and the vibration mode can be adjusted between 1 and 99 to meet various needs. The remote control has three channels and can connect to 3 receivers at the same time Rechargeable and Waterproof Design - The remote control range is about 300 meters, the receiver has a waterproof design, and your dog can swim freely. And can charge the remote control and receiver at the same time Built-in LED Light - There is an LED light on the receiver. You can turn on the LED light of the receiver remotely, making it very convenient to locate your dog at night Adjustable Belt - The collar is made of TPU material, it is long enough to accommodate dogs of different sizes and the excess part can be cut off