1、Working Indicator: Dog bark collar has a built in working light, when none of the dog handler lights are on, this is when the battery IC has stopped supplying power to guard it and alert the owner that it needs to be recharged. 2、Two Modes: Dog training bark collar has a micro sound emitting feature that works gently on dogs; the harsh beeping sound stimulates dogs to stop barking. 3、Adjustable Size: Waterproof dog collar is made from high quality eco friendly nylon webbing and has an adjustable collar length of 6‑35cm/4‑18in to suit all sizes of dogs. 4、Long Standby Time: Rechargeable dog bark collar has a high capacity 300 mAh lithium battery with a long standby time of up to 60 days. 5、Waterproof Design: Dog bark stopper collar is waterproof, so you don't have to worry about damage to the bark collar when your dog splashes or plays in the rain.