IO22C01 multifunction relay control module, designed specifically for a variety of users with different needs, the use of micro-controller as the primaryControl unit, preset 18 kinds of functions, and can be based on user needs, customize and add other specific functions.Genuine high quality power relay modules, high power high-voltage transistor, red, blue signal lights, military grade double-sidedPCB board, cloth board to consider a comprehensive, stable performance, can be widely used in a variety of power control type applications. Features: 1 new upgrade to version 3.0, the module functions by eight kinds before, increased to 18 kinds, to meet the needs of more applications;2 Power is DC 12V3 uses top-quality high-voltage power supply modules, discrete power supply before replacing the system more stable and reliable;4 increased 0.1 seconds timing, timing accuracy from the previous 0.1 seconds, upgrade to 0.01 seconds;5 increase in automatic power saving feature, users can independently set.6.Size:66.5x37x19mm7 Weight : 26 grams 1.GND : DC 12V Negative2.12V : DC 12V Positive3.IN1:Input signal interface. (2.5-24V high voltage to be valid; 0-0.6V low voltage to be invalid;0.7V-2.4V voltage is unpredictable,you should avoid this voltage range) Module Output: There have three interfaces, all interfaces have terminal.1.NO : Normally open interface,the relay becomes vacant before, after pull-in short with the COM;2.COM : Common interface;3.NC : Normally closed interface, short with COM before, become vacant after pull-in.