Esky Rechargeable LCD Remote Shock Control Pet Dog Training Collar with Vibration/Shock 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 Three modes available for two dogs as a whole ; 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 100% tested product with 1 Year Free Replacement Warranty; BUY WITH CONFIDENCEThe wireless remote control has a range of 800 m(2500ft) in optimal conditions RELIABLE AND FRIENDLY CUSTOMER SERVICE ready to respond within a 24 hour time frame. 30-Day Money Back Guarantee, 12 Month Replacement Warranty and Lifetime Support GuaranteeThe 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