Sony has introduced yet another memory card format, the Memory Stick Micro (M2), this time aimed specifically at mobile phones. According to the company, the M2 is one-quarter the volume of the Memory Stick PRO Duo, but only 1.2 mm thick. It supports dual-voltage (1.8 and 3.3 volts) and can be used in PRO slots with an adaptor. The cards will be available in March (256 MB and 512 MB) and May (1 GB).