?Humanized Design?No-Shock Mode: Press the shock setting button to adjust the level to"0", suitable for dogs under 55 lbs. Double Safe: 2 activation conditions, Bark and vibration from vocal cords. Two Silicone Sleeves can protect the dog's skin from damag ?Adjustable Mode Levels?Bark collar with 7 intensity levels and 3 sensitivity levels. There are 3 test training modes of beep, vibration and shock, providing a variety of training methods. ?No Need to Charge?The bark collar comes with two AAA(LR03) batteries and can be used for about 16 days. ?Fits Most Dogs?With two collar straps, the size can be adjusted freely. Rivet Straps On The Machine: Suitable for dogs 15-55 lbs. Another Free Long Strap: Suitable for dogs 15-110 lbs. (Excess length can be cut off with scissors) ?Waterproof?The bark collar is resistant to rain, snow and mud splashes. You can walk with your pet indoors and outdoors in any weather.