The Claber electronic water timer is perfect for those who do not like computers. It takes just seconds to select from any of the 15 pre-set programs. Will run for an entire season on (1) 9V battery (not included). Patented circuitry is completely sealed and watertight to prevent damage to electronic parts. Built-in washable sponge filter traps harmful contaminants that could clog or damage valves in other timers.