This controller is a 4-channel time relay; each channel of relay can run independently and it also can run in turn. It can be controlled by detecting four channels of input voltage signal to control four loads on/off independently or in turn, such as controlling four solenoid valves to work independently or work in turn, controlling four input signal to delay on/off, etc. Specifications: Timing Range: 0.1s - 9999min Adjustable Cycle: 0 - 9999 times Adjustable Working Power Supply: DC6-40V Four Signal Input Impedance gt; 100K Input Signal Voltage Range: DC0-40V Working Current: When backlight off current is about 9mA/12V(0.11W) 4 Relays Working Current: about 170mA/12V(2W) Four Set of Conversion(normally open and normally closed) Contact Load: 10A/277V AC or 10A/30V DC Contact Resistance: lt; #61;100m (1A 6V DC) Mechanical Durability: 10 million Electricity Durability: gt;100,000 (10A-250V AC) Operating Temperature: -40~85C Item Size: 11 * 8.5 * 3.7cm / 4.33 * 3.35 * 1.45in Item Weight: 196g / 6.92oz Package Size: 15 * 9.5 * 5cm / 5.91 * 3.74 * 1.97in Package Weight: 248g / 8.76oz Package List: 1 * Relay Module