REMOVABLE AND SAFE RUBBER SHOCK ABSORBER HEAD. Highly conductive silicone for the contact points is safer than other metals. The shock absorber head does not come into direct contact with the skin, protecting your dog from skin injuries. The shock head is removable. When you don't need the shock mode, you can unscrew the shock head to reduce friction on the dog's neck. 【2600 FEET SUPER REMOTE CONTROL RANGE】The remote control range of this dog training collar is up to 2600 feet (875 meters), easy to train your dog in the park or yard, no need to worry about them going too far. You can control each collar individually or together. If you want to control each collar separately, you can pair receivers on different channels. If you want to control each collar at the same time, you can pair the receivers to the same channel. 【BUILT-IN LED LIGHT AND REFLECTIVE COLLAR】Special built-in LED light on the receiver and remote helps you find your dog even in dark environments. And the reflective