This little module comes with a 24AA02e48 2Kb (256Byte) i2c EEPROM with Pre-programmed Globally Unique, 48-bit Node Address (MAC address).
This is the PCB to make a mounting the LEDs easier and to provide extra power to the IR LED.
This is the board to make a mounting the LEDs easier. Board comes pre-assembled.
This is the assembled boards to make head sensors.