Built-in sensor can automatically identify the closed hand and give soap liquid out. no need to press the button by your wet hands, you can get soap liquid quickly and efficiently. 5cm is the best sensor distance. put your hands under the outlet for a while, then the soap dispenser will release 1ml soap liquid each time. Designed with a transparent window on its body, which is convenient to show you the inside volume of soap liquid at real time, avoiding soap liquid short problem. Powered by four pieces AAA batteries(not included), no limitation of the power cable, which is convenient to place any place you like. Made of high quality ABS material, tough and durable, owning long using life span. besides, the soap dispenser is shaped in the simple minimalist style, fashionable and classic. Widely suitable for restaurant, hotel, kitchen, bathroom, and so on. Specification: Material: ABS+PC Sensor: IR sensor Capacity: 400ml Battery: 4* AAA(not included) Size Chart: Size: 70x116x214mm / 2.76x4.57x8.43inch Package Includes: 1 Piece Soap Dispenser 1 Piece Manual 1 Piece Package Box Note: The color may be different for different display, pls understand Pls allow 1-3mm error due to manual measurement.