This part is a kind of semiconductor called SEN136B5B.

Function of this product has Seeed Ultrasonic Sensor.

Manufacturers : Seed Studio Works

Image and pinout :

Some of the text within the PDF file :

Seeed Ultrasonic Sensor Seeed ultrasonic sensor is non-contact distance measurement module, which is also compatible with electronic brick. It’s designed for easy modular project usage with industrial performance. Features Detecting range: 3cm-4m Best in 30 degree angle Electronic brick compatible interface 5VDC power supply Breadboard friendly Dual transducer Arduino library ready Specifications Supply voltage Global Current Consumption Ultrasonic Frequency Maximal Range Minimal Range Resolution Trigger Pulse Width Outline Dimension 5v 15 mA 40k Hz 400 cm 3 cm 1 cm 10 μs 43x20x15 mm Practical test of performance, Best in 30 degree angle Page 1 of 2 5/14/2010 Free Datasheet http://www.datasheet4u.net/ Sequence chart A short ultrasonic pulse is transmitted at the time 0, reflected [ ... ]

SEN136B5B PDF Datasheet Download