【Safety Anti-Bark Collar】- Our collars work in combination with sound and vibration to train dogs effectively and safely. After 2 sound warnings, if the dog continues to bark, the collar will combine sound and vibration to train the dog to understand that the barking is fake (if still barking, the sound/vibration will not stop in sleep mode ).【Rechargeable Bark Shield】- Rechargeable, which makes it more convenient, saves time and money for the owner while protecting the environment. Fully charged in 2-3 hours.[7 Level Sensitivity Adjustment] - 7 level sensitivity is adjustable, because different dog’s barking degree is different, so we set different sensitivity level for sound. The effect will be better.【Suitable for medium to large dogs】- You can adjust the size according to your dog’s neck size, the diameter of the dog leash is 35cm wide, and the small can measure 6 cm and suitable for all dogs【Easy to use】 - This harmless dog collar is not a remote control. The anti-bark collar