4 Adjustable Sensitivity Levels & LED Indicator: The anti-bark collar has 4 sensitivity levels that can effectively detect barks from dogs of all sizes. Select a sensitivity level based on your dog. 4 is the most sensitive, and 1 is the least sensitive. LED indicators let you know which level you are on, which mode, and even the battery status when it is low. Smart Training Mode & Auto-Protection System: The two training modes are Sound + Vibration and Sound + Vibration + Shock. The anti-bark dog collar does not require a remote control. On the second mode (with shock), the collar will make 6 corrections, pause for 2 minutes, and then resume again. Better Interference Management: The anti-bark collar is equipped with a smart sensor that works in tandem with a microchip to effectively detect the barking of the dog wearing it, while filtering out interference. The collar is activated only when the dog wearing it barks, and this very quickly. Rechargeable and IP67 Waterproof: Low power