4 Channel Solid State Relay Module 
5V Omron solid state relays 240V 2A, output with resistive fuse 240V 2A. 
Input power supply: 5V DC (160MA) 
Input control signal voltage: 5V 
The blue KF301 terminal connection control line is more convenient. 
This is 4 Channel 5V Solid State Relay Module Board OMRONfor Arduino. Compares with the traditional mechanical relay, the Solid State Relay (SSR) has many advantages: it has a longer life, with a much higher turn on/off speed and no noise. Besides, it also has better resistance to vibration and mechanical shock and better moisture-proof performance. 
This Solid State Relay Module is based on Omron G3MB, to control current up to [email protected], can be widely used in various areas such as computer peripheral interfaces, temperature/speed light adjustment, servo control, petrochemical, medical instrumentations, financial devices, coal, meters, traffic signals, etc.