Sony Memory Stick PRO-HG Duo HX 4GB. Internal memory: 4096 MB, Read speed: 20 MB/s, Write speed: 15 MB/s. Weight: 2 g, Width: 31 mm, Depth: 1.6 mm. Power consumption (write): 100 mA, Input voltage: 2.7 - 3.6 V. Operating temperature range (T-T): -25 - 85 °C. Colour of product: Black