FEATURES :- With isolation groove in control area and load area.- With power and relay action indication, bright when connect and go off when disconnects.- When there is a signal in signal input, public side and common side will breakover.- It can be not only used as a microcontroller development board module, but also as a home appliance control.- It can not only control the DC or AC signal, but the 220V AC load.- With a permanent open and close vents contact.- It is convenient to connect with blue KF301 terminal access control cable.SPECIFICATION : - VCC : Power interface ,5V- GND : Ground- IN : Control interface .Drive Current at least 4mA- COM : Control circuit ground ,Connect to GND- Size : approx. 41 x 16 x 16mm