This part is a kind of semiconductor called ADPD144RI.

Function of this product has Integrated Optical Module.

Manufacturers : Analog Devices

Image and pinout :

Some of the text within the PDF file :

Data Sheet Integrated Optical Module with Ambient Light Rejection and Two LEDs ADPD144RI FEATURES GENERAL DESCRIPTION 2.8 mm × 5.0 mm module with integrated optical components One 660 nm LED1, one 880 nm LED2, one 4-channel photodiode True 2-channel, 370 mA LED driver Specifically designed for ultralow direct optical reflections Separate LED and AFE settings for each channel Dual data registers for each LED return signal 14-bit ADC 20-bit burst accumulator enabling 20 bits per sample period On-board sample to sample accumulator enabling up to 27 bits per data read Custom optical package made to work under a glass window APPLICATIONS Optical heart rate monitoring Reflective SpO2 measurement The ADPD144RI is a complete photometric system designed to measure optical signals from ambient [ ... ]

ADPD144RI PDF Datasheet Download