PNY Secure Digital™ High Capacity 4GB. Internal memory: 4096 MB, Flash card type: Secure Digital (SD), Read speed: 20 MB/s. Width: 24 mm, Depth: 32 mm, Height: 2.1 mm. Operating temperature range (T-T): 0 - 55 °C, Storage temperature range (T-T): -20 - 65 °C