Using the ASI 20333 soap dispenser is a breeze. First, make sure to install it in a spot near the sink on a countertop with a 1 - inch diameter opening. Then, insert four D - size 1.5 - volt batteries (not included). Fill the 54 oz translucent container with your preferred soap, detergent, or lotion. When you wave your hand in front of the built - in motion sensor, the dispenser will automatically release 0.04 ounces of the liquid. Keep an eye on the blue and red LED lights. If they light up, it could mean there's a problem with the battery charge or the soap viscosity. Maintenance is simple. Just clean the exterior regularly with a soft cloth. Check the batteries every few months and replace them when needed. Also, refill the soap container when it gets low. This dispenser is built for high - traffic areas, so it can handle frequent use with ease.