HUABAN 3 Pack KY-019 5V One Channel Relay Module Board Shield for PIC AVR DSP ARM for Arduino Relay

1.New 5V Relay Module 2.Can be used as microcontroller development board module can be used as home appliance control 3.5V-12V 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