The Pro-Leaf TIMER-B1, a digital cycle timer, offers simple and precise control of running time for one 240V device. This timer controller can realize the time setting to second, and set the on/off time based on 24hours. Inner photocell sensor also enables to control the running time separately in day time and night time. TIMER-B1 features a digital clock with lithium battery backup to maintain cycle in case of power loss.