MICRODIA XTRA 52x 8GB MicroSDHC Card with SD Adpater Read/Write Speed: 52X / 7.8 Mbps Made for the latest Mobile Phones, 2.5G/3G/3.5G Mobiles, PDA, Smart Phones, etc.. 100% Water/Heat/Dust Proof Speed performance rating: Class 4 Comes with Lifetime Limited Warranty