Got this for my new Samsung Galaxy 5.0.I can't understand why someone would buy a Class 4 for only 5 or 6 bucks cheeper than this Class 10 Micro SDHC.VERY fast 30mbs speed.Comes with adapter for PC.Been using San Disc Flash Memory for years with no complaints.If your using an Android device or anything that need fast data transfer this card won't dissapoint!!!