It is a MCU based relay module with many functions, such as make your system work after some time, make your system work when you give a signal, make your system work periodically and etc. There is a infrared remote(IR) receiver on the board. And we use our IR controller instead of traditional keys to make the function and set the very convenient.  If you want to have many modules with the same function and , you can use just use one IR controller to set them at the same time. And you can also use one IR to control your modules work simultaneously.  Note: If you have any operational problem, please feel free to contact us.    Descripti 100% Brand new and high quality Type：Latching / self-lock Power input protect 12V Relay supported Maximum load : AC 250V/10A, DC 30V/10A. Multifunction integrated Flexible work time range: 0-999milliseconds ;  0-999seconds ;  0-999minutes ;  0-999hours Precise time delay: up to 0.1% High and low level supported IR Remote Controller equipped 3-bit digital tube display 1 power indicator LED 1 relay indicator LED Can be controlled by , 8051, AVR, PIC,DSP, ARM Module Size:Approx. 55.8mm× 50mm× 18.5mm / 2.2inch x 1.97inch x 0.73inch Module Details: rigger lever used to select the level, it is defined as below: Low -- connect the middle pin to the right High -- connect the middle pin to the left Digital tube is used to display the time when it works or display you are setting them. VCC: Input,  : 5V-25V DC GND: Input,    IN+ : Input,  input + IN- : Input,  input - , connected to NO:  Output, Relay output, normal open. Before relay closes, this pin is not When relay closes, this pin is connected with COM. COM: Output,  Relay output, Common pin NC: Output, Relay output, normal close. Before relay closes, this pin is connected with COM. When relay closes, this pin is not K1: Input,  User key1, used to lock or unlock the module. When the module is locked, it cannot receive the IR signal. K2: Input,  User , used to power on or off the digital tube. When don’t need IR Controller Details: Open the module(apply a signal) OFF: Cut off the module (apply another signal) MS:  Set the time to millisecond Sec:  Set the time to second Min:  Set the time to minute Hour:  Set the time to hour Mod: Select the function CH:  Not used Sav:  Save the set time the incorrect time you have input just now Number 0-9: used to input the time  Applications: Home Appliances Automotive industry Industrial control Auto control Package Includes: 1 x  Timer Relay Module 1 x  Remote Control ( Powered by 2 x LR1130 batteries ,not inluded )