This part is a kind of semiconductor called TEA2025.

Function of this product has STEREO AUDIO AMPLIFIER.

Manufacturers : Unisonic Technologies

Image and pinout :

Some of the text within the PDF file :

UNISONIC TECHNOLOGIES CO.,LTD. TEA2025 LINEAR INTEGRATED CIRCUIT STEREO AUDIO AMPLIFIER  DESCRIPTION The UTC TEA2025 is a monolithic integrated audio amplifier in a 16-pin plastic dual in line package. It is designed for portable cassette players and radios.  FEATURES *Working Voltage down to 3V *Few External components *High Channel isolation *Voltage gain up to 45dB(Adjustable with external resistor) *Soft clipping *Internal Thermal protection  ORDERING INFORMATION Order Number Lead Free Halogen Free TEA2025L-D16-T TEA2025G-D16-T Package DIP-16 DIP-16 Packing Tube  MARKING www.unisonic.com.tw Copyright © 2014 Unisonic Technologies Co.,LTD. 1 of 7 QW-R107-033.C TEA2025  PIN CONFIGURATION LINEAR INTEGRATED CIRCUIT  BLOCK DIAGRAM 9 10 THERMAL PROTECTIO [ ... ]

TEA2025 PDF Datasheet Download