PNY Compact Flash Optima 4GB. Internal memory: 16384 MB, Flash card type: CompactFlash (CF), Read speed: 18 MB/s. Weight: 11.3 g, Width: 36.4 mm, Depth: 42.8 mm. Mean time between failures (MTBF): 1000000 h. Operating temperature range (T-T): 0 - 70 °C, Storage temperature range (T-T): -20 - 85 °C, Operating relative humidity range: 0 - 95 %