PNY Secure Digital High Capacity Optima 8GB. Internal memory: 8192 MB, Flash card type: Secure Digital High-Capacity (SDHC). Mean time between failures (MTBF): 1000000 h. Input voltage: 2.7 - 3.6 V. Operating temperature range (T-T): 0 - 55 °C, Storage temperature range (T-T): -20 - 65 °C