The Aiwa HS-PX 397 is a stereo cassette player that was manufactured in Japan from 1999 to 2000. It features a sleek silver design and is compact in size, measuring 112.9 x 29.3 x 84 mm and weighing 124g without batteries. The device operates on two AA batteries, providing 3 V DC power. A notable feature of the HS-PX 397 is its remote control capability, which can be accessed through the included Aiwa HP-M 009 earphones. It has a rated output voltage of 2 V DC and a current of 350 mA. The player supports various tape types, including Type I, II, and IV. The frequency response varies from 30 Hz to 14 kHz for Type I, 30 Hz to 16 kHz for Type II, and 30 Hz to 18 kHz for Type IV tapes. The auto-reverse functionality adds convenience for users, while Dolby B noise reduction is also supported. Additionally, the HS-PX 397 is equipped with a Multi Sound Processor (MSP) that enhances audio output with features like Super Bass and EarGuard. However, it does not include CD synchro recording, Dolby C, or other advanced sound controls.