Features:
- The new 5V Relay Module 
- Can be used as microcontroller development board module can be used as home appliance control 
- 3,5 V-12V to TTL control signal 
- The control signal DC or AC, 220V AC load can be controlled. 
- There is a normally open and one normally closed contact 
- A power indicator light 
- A control indicator, pull off, disconnect does not shine 
- Transistor drive to increase the relay coil control pins high impedance. 
- The control pin has a pull-down circuit to prevent malfunction relay vacant