1, new 5V Relay Module;
2, can be used as microcontroller development board module can be used as home appliance control;
3, 5V to TTL control signal;
4, the control signal DC or AC, 220V AC load can be controlled;
5, there is a normally open and one normally closed contact;
6, a power indicator light;
7, a control indicator, pull off, disconnect does not shine;
8, transistor drive to increase the relay coil control pins high impedance;
9, the control pin has a pull-down circuit to prevent malfunction relay vacant.