3 level soap volume design: High(1.8g)/Mid(1g)/Low(0.6g) for options Low price with high quality Equipped with high precision infrared sensor, soap could be foamed and dispensed in 0.25 second. Move hand to sensor area and get soap. Keep hands cleaner with less contact than using a pump bottle. Long battery Life : Large battery , it will can use about 3 months after full charged generally . Quick click power button to switch soap volume;Different color indicator lights indicate different soap volume:White(High),blue(Mid),green(Low)..syi