AGPtek 2 Dogs 1000 Yards Long Distance Backlit Remote Contorl Pet Dog Shock Vibrate Training Collar Waterproof Rechargeable(Please note that every time you pull out the batteries,you need to match code again Adjustable Collar Length: Max. 24inch Min.19inch. Waterproof and rechargeable, LED signal, beep signal. Collar and transmitter rechargeable with lithium batteries. You can check the battery by viewing the indicator on the remote or by viewing the LED on the collar. Range up to 1,000 yards. 4 Levels of static correction. LED light can be used as a training signal. Both remote and collar go on sleep mode after about 3 minutes. Besides, please be noted that: 1.When use the shock function, please make sure that the collar is with the suitable screws		 2.If you hear a little ratting sound inside the collar,please dont worry. It is the Touch switch used to wake up the collar when in sleep mode 3.Before trainning your dog,please adjust the belt and make screws attach to your dog