This part is a kind of semiconductor called ALP1205S.

Function of this product has ELECTROMAGNETIC BUZZER.

Manufacturers : ETC

Image and pinout :

Some of the text within the PDF file :

MESSRS. SPECIFICATION FOR A P P R O VA L ITEM : ELECTROMAGNETIC BUZZER M O D E L : ALP1205S WE HERE APPLY FOR AUTHORIZATION TO SUPPLY THE ABOVE MENTIONED ON THE BASIS OF THE FOLLOWING SPECIFICATION 1.SCOPE THIS SPECIFICATION IS APPLIED TO THE ABOVE MENTIONED ELECTRO MAGNETIC BUZZER. 2.MECHANICAL CHARACTERISTICS 2-1 EXTERNAL DIMENSION EXTERNAL DIMENSION, INDICATION ARE AS SHOWN IN DRAWING SHEETS 2-2 APPEARANCE FINISHING SHALL NOT BE ACCOMPANIED BY REMARKABLE RUST, DISTORTION, CREAK, ETC. 2-3 TENSILE STRENGTH OF TERMINAL PIN EACH TERMINAL PINS SHALL BE NO ABNORMALITY WHEN THE EQUIPMENT IS PROPERLY FIXED AND 1kg OF LOAD IS GIVEN FOR 30+/-5 SEC. IN AXIS DIRECTION OF TERMINAL. 3.ELECTRICAL CHARACTERISTICS (AT 25 ℃) 3-1 OPERATING VOLTAGE : 3- 7V 3-2 RATED VOLTAGE : 5V 3-3 RESONA [ ... ]

ALP1205S PDF Datasheet Download