PNY Secure Digital™ Optima 1GB. Internal memory: 1024 MB, Flash card type: Secure Digital (SD), Read speed: 10 MB/s. Width: 24 mm, Depth: 32 mm, Height: 2.1 mm. Operating temperature range (T-T): -25 - 85 °C, Storage temperature range (T-T): -40 - 85 °C