This part is a kind of semiconductor called HC-SR04.

Function of this product has Ultrasonic Ranging Module.

Manufacturers : ELECFreaks

Image and pinout :

Some of the text within the PDF file :

Tech Support: services@elecfreaks.com Ultrasonic Ranging Module HC - SR04  Product features: Ultrasonic ranging module HC - SR04 provides 2cm - 400cm non-contact measurement function, the ranging accuracy can reach to 3mm. The modules includes ultrasonic transmitters, receiver and control circuit. The basic principle of work: (1) Using IO trigger for at least 10us high level signal, (2) The Module automatically sends eight 40 kHz and detect whether there is a pulse signal back. (3) IF the signal back, through high level , time of high output IO duration is the time from sending ultrasonic to returning. Test distance = (high level time×velocity of sound (340M/S) / 2,  Wire connecting direct as following: 5V Supply Trigger Pulse Input Echo Pulse Output 0V Ground Electric Parameter [ ... ]

HC-SR04 PDF Datasheet Download