Perfect for Training, Simple and Effective: the electric shock collar is designed with 3 extremely efficient harmless modes : beep(standard), vibration(standard), safe shock (adjustable 1-16 levels), which can help you train your dog behave well. Up to Almost 1000ft Range: The remote training range of this e collar is almost 1000ft, which makes sure you can enjoy the training time with your dog in the backyard, the park, at the beach or anywhere else. The remote also features a dual channel to support training 2 dogs simultaneously. Additional collar should be purchased separately. Rechargeable and IPX7 Waterproof: the electronic collar is rechargeable with built in lithium battery. You can charge the shock collar with your phone adapter, which is very convenient. The collar receiver is waterproof IPX7, offering you maximum flexibility during the outdoor activities.