6d 300m Remote Pet Training Collar with Waterproof and Rechargeable Remote range up to 300m,rechargeable and waterproof for collar 4 working modes: static shock, vibration, beep and light .100 levels of vibration & static with big electric current stimulate, more effective for unruly dog Fits all dogs. Durable adjustable TPU collar size from 67-71cm long;The most effective and safest training system with auto-protect mode Big LCD displays all instructions & LED light for lighting at night;Power saving design with automatic standby;