CnMemory MS Pro Duo 4GB. Internal memory: 4096 MB, Read speed: 7.5 MB/s. Weight: 2 g, Width: 20 mm, Depth: 1.6 mm. Input voltage: 2.7 - 3.6 V. Operating temperature range (T-T): -25 - 75 °C, Storage temperature range (T-T): -30 - 75 °C. Colour of product: Blue