This part is a kind of semiconductor called SRF04.

Function of this product has Ultrasonic Range Finger Application Note.

Manufacturers : Parallax

Image and pinout :

Some of the text within the PDF file :

599 Menlo Drive, Suite 100 Rocklin, California 95765, USA Office: (916) 624-8333 Fax: (916) 624-8003 General: info@parallax.com Technical: support@parallax.com Web Site: www.parallax.com Educational: www.stampsinclass.com Devantech SRF04 Ultrasonic Range Finder (#28015) The Devantech SRF04 ultrasonic range finder provides precise, non-contact distance measurements from about 3 cm (1.2 inches) to 3 meters (3.3 yards). It is very easy to connect to BASIC Stamps or the Javelin, requiring only two I/O pins.1 The SRF04 library makes this device very simple to use and is an ideal component for robotics applications. The SRF04 works by transmitting an ultrasonic (well above human hearing range) pulse and measuring the time it takes to "hear" the pulse echo. Output from the SRF04 is in the form [ ... ]

SRF04 PDF Datasheet Download