Hot Spot Waterproof Rechargeable LCD Remote Shock Control Pet Dog Training Collar with 100 Level of Vibration + 100 Level of Static Shock (Newest Collar 300 Yards with Blue Back-light Screen and TPU Belt) Rechargeable and Waterproof LCD digital remote control electric training collar remote control electric shock devices Convenience of easy-to-read Blue Backlight LCD screen shows the stimulation level. Over 3000 different identity codes to prevent conflicts with other e-collars. 4 modes: static shock/ vibration/ beep/ light with 100 levels of vibration & static Rechargeable Handset + Rechargeable Collar Receiver. No More Replacement Batteries Required! 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)