This part is a kind of semiconductor called ABT-402-RC.

Function of this product has Piezo Transducer.

Manufacturers : ABC

Image and pinout :

Some of the text within the PDF file :

ABT-402-RC SPECIFICATION SHEET Features: • Low Power Consumption • PCB Mountable • Sealed Base • Wave Solderable and Washable All data at 25ºC unless otherwise specified. SPECIFICATIONS Rated Voltage (Vp-p Square Wave) Operating Voltage Rated Current at rated voltage Capacitance Sound Output at 4,000Hz at 10cm, at rated voltage Resonant Frequency Operating Temperature Storage Temperature Weight ABT-402-RC Piezo Transducer 5Vp-p 1~20Vp-p 1mA 13000±30%pF ≥80dB 4000 ± 500Hz -20 ~ +70ºC -30 ~ +80ºC 1g DIMENSIONS: (UNIT: mm, TOLERANCE: ±0.5mm) [ ... ]

ABT-402-RC PDF Datasheet Download