Using this soap dispenser is easy. First, choose your power supply, either the battery pack or the A/C adapter. Then, fill the 70.5oz soap tank through the top - fill spout with liquid soap having a viscosity between 100 cps and 5000 cps. When you place your hand near the dispenser, the touch - free dual sensors will detect it and dispense soap. The indicator light at the base of the spout will show you if it's powered on, when it's activated, and when the soap is running low. Please note that this item is non - returnable. To maintain it, keep it clean with a soft cloth. Since it has a vandal - resistant construction, it's quite durable, but avoid hitting it hard. Make sure to follow the ADA guidelines for proper installation and use.