Performance: 90MB/s read, and 45MB/s write, Ultra-High Speed Bus I (UHS-I). Compatible: SDHC & SDXC host devices, not compatible with standard, SD-enabled devices/readers; SDXC cards are not compatible with SDHC-enabled devices/readers4. Secure: built-in write-protect switch prevents accidental data loss. Dimensions: 0.94" x 1.26" x 0.08" (24mm x 32mm x 2.1mm). Operating Temperatures: -25 ºC to 85 ºC /Storage Temperatures: -40 ºC to 85 ºC. Voltage: 3.3v.