High Speed USB 2.0 Professional Micro SD TF T-Flash Memory Card Reader Writer Adapter Black USB powered (no external power or battery needed). Easy to transfer data between your digital camera, PC & your cell phone. System requirements: PC/ Mac computer with USB port, Windows 2000, XP, Vista, 7, 8, Mac OS 9.0+. Support Micro SD or T-Flash Memory Card only Size:3.5cm x 1.8cm x 0.8cm-1.37inch x 0.71inch x 0.31inch.