Product:USB Pen Model: U501B Interface: USB 2.0 Descriptions: ?Overview: IBM PC/AT or compatible Desktop or Laptop or Mac computer with USB port Microsoft Windows 98 SE/ME/2000/XP or above Linux kernel 2.4 or above MAC OS 9.X or above ?Capacity: 64M/128M/256M/512M/1G/2G ?Color: Silver ?Material: Aluminium Alloy Housing Stylus ?Dimension: 140mm(L) * 15mm(D) ?Weight: 43g