The SanDisk 1GB Micro M2 can be used in Memory Stick PRO Duo slots when used with the included adapter to increase the compatibility range of devices they will function in. The M2 card also has dual voltage capabilities for use in mobile phones and other portable devices. The mobile phone voltage is 1.8v for new Sony Ericsson models, and also 3.3v for Memory Stick PRO Duo compatible devices.