Pack of 5pcs 5V 1 Channel Relay Shield High Level SRD-05VDC-SL-C Relay Module for Arduino FZ0069X5
Brand new 5V relay module
Microcontroller development board can be used as modules, can be used as appliance control
5V-12V control signal of the TTL
Control DC or AC signals can control the 220V AC load.
There is a normally open and one normally closed contact
Controlled light, pull off, off off
Increased transistor drive a relay coil, the control pin high impedance.
Control pins have pull-down circuit, to prevent floating relay malfunction
5 X 5V 1CH Relay module
Note: the last picture is only for reference, you can use this relay module to work with PIR sensor, you can google more projects example.