Intelligent Identification Chip: The microprocessor intelligently detects the dog barking technology, which can safely and effectively filter other unrelated sounds and prevent false triggering. The receiver is designed with a digital display to show the level, and red light for 'beep + vibration + shock' mode, green light for 'beep + vibration' mode, each mode has 1-5 adjustable intensity levels. You can choose which level as you like. Intelligent Dual- Mode and Automatic Protection System - dual training mode: beep + vibration, beep + vibration + shock. In the non-shock mode, there is no limit to trigger, as long as dog barking is detected, it will trigger: In shock mode, if the barking of the dog continues, the device will perform six different levels in turn, sleep for two minutes after the completion of the six levels, and return to the initial state to protect the pet. In automatic protection mode, press any button to Rechargeable & Waterproof: The collar contains a built-in USB rechargeable battery. It can be fully charged in about 2-3 hours and gave you 10-15 days of use. IP67 waterproof level design and suit for dog swimming in summer and shower. The waterproof charging interface is designed more durable. Adjustable & Reflective Nylon Belt:Adjustable collar length 1.2-7.2inch, fits 6-150 lbs dogs, suitable for small/medium/large dogs.The belt of collar has 2 reflective strip sewed in， which means you could find your dog in the dark environment, at dusk, thick foggy condition. 100% Money Back Guarantee Service:If you are not satisfied with our product, we will offer you full refund or new replacement. You do not take any risk to purchase here. This bark collar is very high quality, welcome to try this product and you will not regret your choice here.