Tolako 5v Relay Module for Arduino ARM PIC AVR MCU 5V Indicator Light LED 1 Channel Relay Module Works with Official Arduino Boards Microcontroller development board can be used as modules, can be used as appliance control 5V - 12 V control signal of the TTL Control DC or AC signals can control the 220V AC Load there is a normally open and open normally closed contact Useful to control a motor, a led strip, or any other module using arduino. How to use it: Just connect a digital output of your arduino to your relay module, and you can control a power-demanding appliance with the digital signal provided by your arduino.