ITEM NAME:1 pcs One way Solid State Relay Module For Arduino C4A9 1 pcs One way Solid State Relay Module For Arduino C4A9 5V Omron solid state relays 240V / 2A, output with resistive fuse 240V /2A. Dimensions: 25 x 34 x 25 (length x width x height) Input Power: 5VDC Control signal input voltage: (0-2.5V low state relay ON) (3-5V state high relay OFF) colour: red + black Material: plastic Voltage: 5V Quiescent current: 0 mA Operating current: 12.5mA Trigger Voltage: 3.3-5V Trigger current: 2mA DC +: positive power supply (according to the relay voltage supply)DC-: negative power supplyCH1: relay module signal triggering end (low to trigger active) Package included: 1 x One way Solid State Relay Module For Arduino Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.