Esky EP-300R-B1 300 Yards Rechargeable Remote LCD Display Dog Training Collar, Black 100 Level of Vibration + 100 Level of Static Shock+ Tone 15-120lb Dog; Rechargeable remote transmitter and collar-receiver; Rechargeable remote transmitter and collar-receiver Four modes(static shock/vibration/beep/light) at your disposal 100 intensity levels of vibrations/static shocks are adjustable Easy to sync the remote transmitter with the collar receiver The system can be used with 1 or 2 receivers. (The additional receiver should be the same type as your previous one and please search