This is a Lilypad light sensor board, for use with portable electronics
It uses an analog light sensor to measure a voltage between 0 and 5 V output.
The value becomes closer to 0 volts when the cover of the sensor and 5V in daylight
The wires should be connected with conductive threads and sewn into clothing
Diameter: 22mm
Type: TEMT6000 CJMCU-LilyPad