Brand asus item weight 281 g product dimensions 146 x 17 x 42 cm item model number 90 dq0435 ua221kz series sdrw 08d2s u lite color black number of usb 20 ports 1 optical drive type dvd rrw power source 5v operating system windows 7windows vistawindows xpwindows server 2003windows server 2008mac os x 105 battery type 5v