The Casio Exilim EX-S500 is an ultra-slim digital compact that Casio released in June 2005, part of the credit-card-style Exilim S series that prioritised extreme thinness and pocketability over the larger Zoom-series bodies.
It uses a 5-megapixel CCD sensor measuring 1/2.5 inch, behind a 38-114mm equivalent f/2.7-5.2 lens giving 3x optical zoom, and includes Casio's Anti Shake DSP processing to help reduce blur. It records MPEG-4 video, stores files on SD/MMC cards, and runs on the compact NP-20 battery.
The EX-S500's combination of a genuine zoom lens and Anti Shake processing inside an unusually thin card-style body was unusual for 2005, when most ultra-slim compacts had fixed lenses; it traded some low-light performance for that portability.
Used examples are common and inexpensive; check the NP-20 battery still holds charge, that the sliding lens cover and zoom mechanism move freely without catching, and that the small LCD is free of scratches typical of cameras carried without a case.