Aetertek At-215 1 Dog Trainer Remote Dog Training Shock Collar with Vibration and Shock Correction Mode for 15-150lbs Dog Bark Collar, Water-resistant Anti Bark Collar Big and easy to push button for Strong shock + weak shock + strong vibration, user friendly Classic dog shock collar suitable for small to large dog size: 15-150lbs Solid remote control to 600 yards (550m) and signal can pass through walls and fences As 1 dog training system, can be upgraded as 2 dog training if add extra receiver CE,ROHS,FCC,RTTE Approved. 1 Year manufacturer warranty