Soap Bottle can be installed where it is easily accessible for refilling, a very unique and important feature when comparing this soap dispenser to the common variety soap dispenser. 1/4 gallon Soap Bottle, Mounting Hardware, 4 Batteries Pre-installed. Select the soap of your choice from the vendor of your choice, saving both time and money. The installation is similar to that of an electronic faucet, and identical to the installation of common variety electronic soap dispensers.