1000 Yard Dog Training Collar with Wireless Rechargeable Remote for Small and Large Dogs Adjustable Shock, Vibration, Sound Stimulations Waterproof - Train Pet with Advanced Dual Bark Collar 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 . Collar is water-resistant but not water-proof. Delivers effectively harm-free vibration and static shock corrections. Easy to use. When you collar arrives , it will already be synced to the remote. If something happens and it becomes disconnected from the remote for any reason, you can simply reset the receiver and re-sync the remote. Three modes available; A,B,A+B , 1 collar The shock function on this collar is suitable for medium and large dogs. Please don't try it on small dogs. We also suggest customer use low(level one) level shock on medium or large breed first