04. 5v 2 Channel OMRON SSR G3MB-202P Solid State Relay Module For Arduino Size: 55 * 33 * 25 (L * W * H) Weight: 21.5g Input Power: 5V DC (160MA) Input control signal voltage: (0-2.5V state low relay OFF) (3.3-5V state high relay ON) Module interface: Input section: DC +: positive power supply (by relay voltage power supply) DC-: connect power negative CH: Relay module signal to trigger the end (high level trigger effective)