Esky Shock Control Dog Training Collar with Rechargeable LED Backlight Remote Provides a professional 100 level shock and 100 level Vibration with Rechargeable LCD digital remote control electric training Collar Remote control electric shock devices and Rechargeable LCD digital Remote control electric training collar The system can be used for 1 or 2 receivers.(the additional receiver must be the same type as your previous one and purchased from us) Convenience of easy-to-read LCD screen shows the stimulation level. Over 3,000 different identity codes to prevent conflicts with other e-collars. This is a Esky branded product. Any unauthorized imitation of our product is prohibited by US law.