Esky174 Remote Control Dog Training Transmitter & Rechargeable Collar, 100 Level Shock and Vibration (Two Collars) Rehcargeable Handset + Rechargeable Water Resistant Collar Receiver. No More Replacement Batteries Required! Provides a professional 100 level shock and 100 level Vibration with Rechargeable LCD digital remote control electric training Collar Convenience of easy-to-read LCD screen shows the stimulation level. Over 3,000 different identity codes to prevent conflicts with other e-collars. Suitable for dogs between 25lbs and 130lbs The system can be used for 1 or 2 receivers.