Dispensers use patent-pending technology to optimize energy use. Engineered to use a minimal amount of energy per actuation, eliminating the need to change batteries during the life of the dispenser in most installation. Please note batteries are not included. Dispensers use patent-pending technology to optimize energy use. Engineered to use a minimal amount of energy per actuation, eliminating the need to change batteries during the life of the dispenser in most installation. Please note batteries are not included.