AUTOMATIC SOAP DISPENSER -- The soap dispenser with built-in sensor can automatically identify the closed hand and dispense soap liquid. 2-3 inches is the best sensor distance. 1 ml of soap liquid each time and holds the position for 2 seconds for another time donation. Leak Prevention / Waterproof: Make sure the sensor screen is clean.Sealing ring is attached not only to the battery box lid but also to the top spout lid for excellent waterproof function. The waterproof base protects the battery case from water. Use AAA waterproof and leak proof technology to prevent circuit board corrosion by soap or water. APPLICATION -- The soap dispenser is powered by four batteries (not included), without restricting the power cord, making it convenient to place anywhere. The soap dispenser is ideal for restaurants, hotels, kitchens, bathrooms, hospitals, etc.