This part is a kind of semiconductor called APDS-9002.

Function of this product has Miniature Surface-Mount Ambient Light Photo Sensor.

Manufacturers : Agilent

Image and pinout :

Some of the text within the PDF file :

Agilent APDS-9002 Miniature Surface-Mount Ambient Light Photo Sensor Data Sheet Features • Excellent responsivity which peaks in the human luminosity curve Close responsivity to the human eye • Miniature chipLED lead-free surface-mount package Height – 0.80 mm Width – 2.00 mm Depth – 1.25 mm • Good output linearity across wide illumination range • Low sensitivity variation across various light sources • Guaranteed temperature performance -40°C to 85°C • VCC supply 2.4 to 5.5 V • Lead-free package Applications • Detection of ambient light to control display backlighting Mobile devices – mobile phones, PDAs Computing devices – notebooks, webpads Consumer devices – TVs, video cameras, digital still cameras • Automatic residential and commercial lighting manage [ ... ]

APDS-9002 PDF Datasheet Download