The soap dispenser requires 4 pieces of AAA batteries. When installing them, please check the "+" and "-" symbols of the battery and soap dispenser to install correctly. the bottom button. You see the indicator Now the device can work normally. Anti-skid Bottom. This hands-free soap dispenser is IP67 waterproof so that the entire machine can be washed by water. Anti-skid design at the bottom, strong sealing. This automatic touchless soap dispenser has a precise trigger area that can sense your hands quickly, just place your hand under the sensor to get the dispenser to work. It pumps soap liquid of only 1 ml at a time. If you need more, hold your hands under the sensor and wait another 2 seconds, it pump again. This soap dispenser can hold 300ML liquid soap, the visible scale of soap can tell you when to add soap liquid. The bathroom dish soap dispenser can be used in the kitchen, bathroom, hotel, hospital, no wall-mounted installation. The rubber material on the soap dispenser bottom prevent soap leakage, and keep the dispenser not be sliding around your countertop.