Robodo PCF8574 I/O FR I2c port interface support cascading extended module Electronic Components Electronic Hobby Kit

"Features: This is the I/O extended module used for I2C interface, you can use two of these modules to extend 8 I/O. Supports Arduino cascading, and you can use at most 8 modules to extend 64 I/O at the same time. Can be changed the address by set toggle switch. PCB Size: 36 x 16mm/1.41*0.62"". Every 2 seconds, make P0-P7 port output High level, Low level, and put 3 toggle switches to ON, the address of module is 0x27. "