Using this soap dispenser is easy. First, select your power supply, either the battery pack or the A/C adapter. Fill the 70.5oz top - fill soap tank with liquid soap whose viscosity is between 100 cps and 5000 cps. When you need soap, just put your hands under the dispenser, and the touch - free dual sensors will activate. The indicator light at the base of the spout will show if it has power, if it's been activated, and when the soap is running low. Remember, this is a non - returnable item. For maintenance, keep the dispenser clean with a soft cloth. Avoid using abrasive cleaners as they may damage the Brushed Brass PVD finish. Check the anti - rotational gasket/washer regularly to make sure it's in good condition. And follow all ADA guidelines when installing and using the dispenser.