Dane-Elec SecureDigital Card 1Gb. Internal memory: 1024 MB, Flash card type: Secure Digital (SD), Read speed: 3 MB/s. Weight: 2 g. Data retention: 11 year(s). Input voltage: 2.0 - 3.6 V. Operating temperature range (T-T): 0 - 55 °C, Operating relative humidity range: 8 - 95 %, Vibration resistance: 15 G