Esky Rechargeable LCD Remote Shock Control Pet Dog Training Collar with Backlit Display /Vibration/ Static Shock/Tone Rechargeable remote with backlit display; Easy to operate and read the modes and levels on the remote at dark environments. One second press on the menu button wakes it up from sleep mode; never miss any corrections again Rechargeable collar receiver. Collar is water-resistant but not water-proof. Delivers effectively harm-free vibration and static shock corrections. The system can be used with 1 or 2 receivers Three modes available; A,B,A+B; In each mode, you have 8 level Shocks,8 level Vibrations and 3 level tones; The levels can be increased or decreased easily. You can set different level corrections in each mode and choose the proper mode according to your dog behavior The wireless remote control has a range of 800 m(2500ft) in optimal conditions The shock function on this collar is suitable for medium and large dogs. Please dont try it on small dogs. We also suggest customer use low(level one) level shock on medium or large breed first