Dual voltage reduced size Multi Media Card (RS-MMC) MMC mobile removable memory storage comes as a reduced-size MMC form factor and includes an adapter to double as a full-size MMC card. The smaller size, large capacity and dual operating voltage ranges are the perfect match for mobile phones and other portable devices that have limited space and require extended battery life Capacity: 512MB ,1g,2g,4g Dimensions: 18 x 24 x 1.4mm Weight: 1.5g Dual voltage operation: 1.8 or 3.3V Speed: up to 8 MBps read rate Up to 7 MBps write rate Operating temperature: 32 to 140 degrees F (0 to 60 degrees C) Storage temperature: 4 to 185 degrees F (-20 to 85 degrees C) Standardized: complies with MMC system specification version 4.0 Compatibility: Mobiles phones requiring RS-MMC: Nokia: Nokia 3230, Nokia 6260, Nokia 6670 and Nokia 7610 Samsung: Samsung SCH 250, Samsung SCH-A770 Samsung SGH-D710, Samsung SGH-P730, Samsung SGH-P735, Samsung SPH G1000 and Samsung x910 Siemens: Siemens S56 Sunglasses MP3 Player