Capacities 256GB Performance 80MB/s read and 10MB/s write, UHS-I Speed Class 1 (U1) SD Adapter Dimensions 24mm x 32mm x 2.1mm Format exFAT Operating Temperatures -25oC to 85oC Storage Temperatures -40oC to 85oC Voltage 3.3V Item Dimension (L inchxW inchxH inch) 1 x 2 x 1