Automatic sensing, hand washing liquid drips out when you reach out, easy to use. Waterproof and moisture-proof, not easy falling.3. Strong load capacity, suitable for the various wall surface. Note: touch lightly power button one time to switch, the blue/red LED indicator light means to turn on/off. If red indicator light flashes, please kindly check whether the batteries are installed correctly! And try to reinstall new batteries several seconds later. When the liquid level is low, please add liquid. Otherwise, the dispenser will not pump out any liquid. If your liquid is too thick, you need to dilute it with water.