INTELLIGENT RECOGNITION CHIP: Smart design for your dog. The No Bark Collar sends harmless warning shock, progressing through the 7 sensitivity levels. Only your dog’s Sound combined with Vibrations of Sound will trigger the sensors, not just Sound. It won’t be triggered by other dog’s barking. SAFE & EFFECTIVE: Shock mode and No shock mode are optional. Each mode has 7 adjustable levels of intensity. Your dog’s safety is our top priority. Sensor will enter sleep mode if it has been activated for over 7 times. Anti-Injury intelligent recognition chip will bring safe and effective bark control to your dogs. USB RECHARGEABLE & Rainproof: Each collar contains a built-in USB rechargeable battery and 1 hour of charge time gives you 10-15 days of use. Rainproof and suits rainy days. Please take off the collar when the dogs go swimming. STYLISH AND HIGH QUALITY DESIGN: The sensor and vibrating slim unit is made from a solid piece of durable plastic. The frosted black housing is durable and scratch resistant. The belt of collar has 2 reflective strip sewed in, which means you could find your dog even in the darkness. FAST TRAINING: This automatic smart dog bark collar is designed to quickly and efficiently change your dog’s barking behavior. The combination of warning beep and vibration teach your dog in a short time to stop bark to avoid the annoying beep and the sense of vibration which it feels when barking.