The Aiwa HS-PX 505 is a portable cassette player manufactured by Aiwa. It was released in the 1990s and is known for its compact size and solid build quality. The cassette player features Dolby B and C noise reduction, auto reverse function, and a digital tape counter. It also has a built-in AM/FM radio tuner and comes with a pair of stereo headphones. The HS-PX 505 operates on regular batteries and is equipped with a belt clip for easy portability.