Convenience of easy-to-read LCD screen shows the stimulation level. Over 3,000 different identity codes to prevent conflicts with other e-collars. Rechargeable LCD digital remote control electric training collar remote control electric shock devices Provides a professional 100 level shock and 100 level Vibration with 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) Rehcargeable Handset + Rechargeable Collar Receiver. No More Replacement Batteries Required!