Features With isolation groov 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 apermanent open and close vents contact It is convenient to connect with blue KF301 terminal access control cable Specification VCC Power interface 5VGND GroundIN Control interface Drive Current at least 4mACOM Control circuit ground Connect to GNDSize approx 41 x 16 x 16mm 1 61 x 0 62 x 0 62 Weight approx 12gNote 1 High level flip flops shows that there are trigger mode of the voltage between the signal input terminal and the ground That is to say it is a way of short circuit trigger between signal input and VCC positive pole 2 Low level flip flops shows that there are voltage for OV trigger modebetween the signal input terminal and the ground In a word it is a way of short circuit trigger between signal input and GND negative pole 3 Please allow 1 3mm differs due to manual measurement 4 Due to the different display and different light the picture may not reflect the actual color of the item Thanks for your understand Package Included 1 x 1 Channel Relay Module