【3 TRAINING MODES OPTIONS 】Our Dog Training Collar provides w/3 efficient and safe Training Modes, including Beep and Vibration. Levels of vibration are adjustable from 1 to 99. its Can be used to help correct your dogs barking, walking, leash training, sitting, pee, aggression, and other. 【3 CHANNELS MAXIMUM CONTROL 】If you have more than 2 dogs, then you are lucky. The bark training collar supports 3 dogs training with only 1 remote. You just choose a channel CH1, CH2 or CH3 by pressing the CH button. I believe the collar would be the perfect option for you. 【2700FT LONG RANGE FOR CONTROL 】You will fear that the dog is running too far, then you can’t control it. Don’t worry, This pet collars can reach up to 2700ft ( 800 meters), For easy to you train dogs in the park, backyard or anywhere. Long battery life provide you an effective dog training. The strap is adjustable and fits all dogs from 10 lbs to 110 lbs. It’s a ideal harmless collar for small dogs, medium and large dogs. 【RECHARGEABLE&WATERPROOF, MORE CONVENIENT】This Vibration Dog Collar Built-in rechargeable lithium-ion battery. Packing includes USB Charger Cable, Which Can charge remote and receiver together. Both needs to be charged for 4 hours and can be used for a minimum of 7 days. The receiver has a super waterproof performance, it works well even if immersed in water - so your dog can swim or bath freely with the collar on. 【AUTO POWER SAVING FUNCTION,MORE SAFETY】If no operations on the remote within 10s, the back lit of screen will be off, within 30s, it will being sleep mode, the screen display will be shut off. If no sign in the receiver within 5minutes, it will go into standby mode. You could press button to activate it. And the collar max adjustable length size is up to 67cm, suitable for all size dogs.