Lemonbest&reg; 998DR Waterproof Rechargeable Wireless Dog Pet Training collar System, with 100 Level Shock and Vibration for 1 Dog Professional 100 level shock and 100 level Vibration with Rechargeable LCD digital remote control electric training Collar Rechargeable Water-resistant collar W/ Auto sleep feature to save battery life A tone button activates a tone on the Collar Receiver; The collar Receiver will TURN OFF if it is unused for 4 minutes Work with dogs from 15 to 100 lbs; 600 feet range transmitter; 1-year warranty from Lemonbest 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 Lemonbest)