Dog training collar with 2 receivers. This shock collar supports 2 channels, you can train your 2 dogs with one remote at the same time freely. The dog shock collars are perfect for people who have two dogs 3 training modes. Beep, vibration for levels 1 to 8, and shock for levels 1 to 16, which help your dogs get rid of bad behaviors, such as keeping barking, biting, digging, and aggression. Effective to use Fit for 15 to 100 lbs dogs, safe to use. The 7.8 to 24.8 inches adjustable nylon collar fits for small medium large dogs for 15 to 100 lbs. The collar receiver is IPX5 rainproof, your friend can be protected in rains. Not for swimming Up to 1000 ft remote. You can train your dogs in the park, backyard, and anywhere freely. This long lasting battery life lets you forget the trouble of charging cable and long time waiting. The AAA battery is not rechargeable Humanized design. The on and off button of the shock collar for dogs is more like a safety lock and can be turned off. When you finished your training, turning off the button can prevent the dog from being shock by the trainer's misoperation