. Toshiba's Exceria M303 micro SDXC line up with Video Speed Class 30 (V30) a new speed class standard for video recording. to 256 GB perfect for 4K video recording in the fastest & toughest situations as well as for capacity expansion for your smartphone. The new Application Performance Class A1 enables you to store & run Android applications on micro SD cards at optimal levels. The series is made for hard conditions waterproof shockproof X-ray proof & temperature proof. The SD adapter included with the M303 Package gives you a wide variety of use options..