This part is a kind of semiconductor called KPM-1205A.
Function of this product has Buzzer.
Manufacturers : Ningbo
Image and pinout :
Some of the text within the PDF file :
Magnetic Transducer (without driving circuit) KPM-1205A series Magnetic Buzzer FREQUENCY RESPONSE [actual curve of type] DIMENSIONS 34 Bottom View applied voltage: 5 V. 1/2 duty, square wave distance for measurement: 10cm Model No KPM1205A Rated Voltage 5V Operating Voltage 4~8V Max. Rated Current Coil Resistance (DC) Coil Impedance (AC) Min. Sound Pressure Level 40mA 45¡À5¦¸ 80¦¸ 85dB/10cm Resonant Frequency 2400Hz Operating Temperature -20~+70¡æ Weight 2g color Black PBT Housing Material Pin Terminal * Value applying at rated voltage KPM-1212A series Magnetic Buzzer FREQUENCY RESPONSE [actual curve of type] Side View Top View all dimensions are in mm DIMENSIONS Bottom View applied voltage: 12V. 1/2 duty, square wave distance for measurement: 10cm Model [ ... ]