1. First, you need to understand. Automatic Bark Collar: Remote control and automatic bark collar in one, suitable for large, medium and small dogs, which uses an updated version of the smart dog bark control. To test whether the anti-bark mode works properly, we use a new technology in the bark mode. So instead of using the old method of scratching and blowing on the collar, you need to put the collar under the throat and make sure the two contact points touch the neck. You can test the function by placing it on the skin and saying loudly: WU WU WU; ; 2. [400m Operating Range] The remote control training collar has a range of up to 400m, so you can easily train your dog indoors or outdoors. 3. [Waterproof Receiver & Comfortable Collar] The IPX7 waterproof training collar is suitable for dogs who want to play freely in the pool or in the rain. The collar strap length is adjustable to fit dogs weighing over 10 pounds and with neck circumferences from 8 to 24.4 inches! 4. [Fast Charging