Memory Stick Micro (M2) measures up approximatly 15 × 12.5 × 1.2 millimetres roughly a quarter the size of a Memorystick Pro Duo, around the size of a fingernail with 256 MB, 512 MB, 1 GB and 2 GB capacities, with a theoretical limit of 32 GB. Maximum transfer speed is 160 Mbit/s. It comes with an adapter, much like the Duo Sticks, to ensure compatibility with current PRO devices.