The ST354-A1 is a part manufactured by Zettler Group, a global electronics company. It is an audio amplifier, specifically the AZ936 series, which is a single-channel Class-A/B amplifier. The ST354-A1 provides 30 W of power at 4 Ohms, with a frequency response of 20-20kHz. It also features an adhesive-back audio input connector and a STGN (Soft Gain) adjustable gain control, which allows the amplifier to be tuned to the right level. The ST354-A1 is designed for use in consumer electronics, such as CD players, DVD players, and portable music players.