This part is a kind of semiconductor called SRF02.

Function of this product has Ultrasonic Range Finder.

Manufacturers : ETC

Image and pinout :

Some of the text within the PDF file :

SRF02 Ultrasonic range finder Technical Specification Overview The SRF02 is a single transducer ultrasonic rangefinder in a small footprint PCB. It features both I2C and a Serial interfaces. The serial interface is a standard TTL level UART format at 9600 baud,1 start, 2 stop and no parity bits, and may be connected directly to the serial ports on any microcontroller. Up to 16 SRF02's may be connected together on a single bus, either I2C or Serial. New commands in the SRF02 include the ability to send an ultrasonic burst on its own without a reception cycle, and the ability to perform a reception cycle without the preceding burst. This has been as requested feature on our sonar's and the SRF02 is the first to see its implementation. Because the SRF02 uses a single tra [ ... ]

SRF02 PDF Datasheet Download