1. Easy to use, each output group has a simple 3-wire structure, and 6 output terminals are reserved;
2. The input is directly connected to the MCU IO port or digital circuit, the input high-level relay is pulled in, and the input low-level relay is released;
3. The working voltage is 5V, the pull-in current is about 70mA per circuit, and the relay status indicator is provided;
4. Full chip components, the most reasonable drive circuit design, using 8050 transistor to drive the relay action;
5. There are fixed screw holes for easy installation, the size of the circuit board is 1.8cm*4.0cm*1.9cm, and the weight is 15g;

Simple test description: The module input and output are electrically insulated. After the correct voltage is supplied, you only need to connect a high level (such as a short circuit with VCC) to the input pin to make the relay pull in, not connected or connected to a low level (If it is short-circuited with GND) the relay does not operate.