This part is a kind of semiconductor called KPE-123.
Function of this product has Piezo Audio Transducer.
Manufacturers : Kingstate
Image and pinout :
Some of the text within the PDF file :
A. SCOPE ½dÃ¥ This specification applies piezo audio indicator, KPE-123 ¦¹³W®æ®Ñ¾A¥Î©óÀ£¹q¦¡¸Á»ï¾¹ , KPE-123 B. SPECIFICATION ³W®æ ¡½ Test condition: No. Item Unit KHz VDC mA dB VDC Operating Frequency 1 ¾Þ§@ÀW²v Operating` Volt. range 2 ¾Þ§@¹qÀ£½d³ò Operating Current 3 ¾Þ§@¹q¬y Sound pressure level 4 ¿é¥X-µÀ£ Rated Voltage 5 ÃB©w¹qÀ£ Tone 6 Án-µ Operating temp. 7 ¾Þ§@·Å«× Storage temp. 8 Àx¦s·Å«× Dimension 9 ¤Ø¤o Weight (MAX) 10 -«¶q Material 11 §÷½è Terminal 12 ºÝ¤l TEMP=25¢J±2¢J Specification 3.0 ± 0.5 3 ~ 28 MAX 8 MIN 82 12 Continuous ª½-µ Related humidity=65±5% Condition at 12VDC at 30 cm/12VDC ºC ºC mm gram -30 ~ +85 -40 ~ +95 £r 24.0 x H1 [ ... ]