With only 3 programming buttons and easy to read digital screen, this single line timer allows 2 customized watering cycles per day from as little as 1 minute up to 23 hours; 7 days in advance. Weekly and/or manual programs may also be stored into the timer. Patented circuitry is completely sealed and watertight to prevent damage to electronic parts. Built-in stainless steel filter traps harmful contaminants that could clog or damage valves. Operates on one 9v battery (not included).