Behaviors such as failing to heel, chasing vehicles/animals, barking and jumping up are more than just a nuisance, they could land your dogs in a dangerous situation. Help them stay safe and well behaved with this efficient, humane training system.3 Stimulation LevelsThe remote controlled receivers on each collar deliver a harmless static correction that is not painful, but is annoying enough to get your dog"s attention. He will quickly learn to avoid unwanted behaviors that trigger the correction. Choose from 1 vibration and 2 shock stimulation levels to suit your pet"s size and sensitivity.One Remote Does It AllThe universal remote controls two dogs individually with a separate set of buttons for each collar receiver, plus a button to vibrate both dogs at once. Its powerful signal reaches up to 1000 feet away, ideal for off-leash situations. The carrying strap also comes in handy during walks.Rechargeable Receivers Automatically Conserve Battery LifeA smart auto sleep feature turns the receivers off if they remain motionless for a few minutes, prolonging battery life. Movement will turn them back on. They can be recharged with either the wall unit or a computer. Rated water resistant (not waterproof), they are safe to use in rainy weather but should not be completely submerged.Complete Set with 90 Day Money Back GuaranteeThe set includes everything you need: 2 rechargeable receivers, 2 collars that adjust from 12" to 20", 1 remote control with 9V battery, 1 AC wall charger, 1 USB cable, 2 sets of rubber and metal prongs, and 2 testing wires.