SMAKN 5v 2-channel Low Level Solid State Relay Board for Arduino Uno Duemilanove Mega2560 Mega1280 ARM DSP PIC OMRON 5V 240V solid state relay 2A, output with resistance type fuse 240V 2A. size: 55*33*25 (length * width * height) net weight: 21.5g the input power supply: 5V DC (160MA) the input control signal voltage: (the state of the 0-2.5V low level relay ON) (the state of the 3.3-5V high level relay OFF) the blue KF301 terminal is connected to the line of control more convenient. Module interface: