Axiom 64GB SDXC. Internal memory: 65536 MB, Flash card type: Secure Digital Extended Capacity (SDXC). Weight: 2 g, Width: 24 mm, Depth: 2.1 mm. Mean time between failures (MTBF): 1000000 h. Input voltage: 2.7 - 3.6 V. Operating temperature range (T-T): -25 - 85 °C