: IBM ThinkPad X31 Intel Pentium M 1.5GHz Intel 855PM Chipset 256MB DDR 266MHz (1 x 256MB, max 1024MB) 40GB HDD (5400rpm) 8X / 24X / 10X / 24X DVD/CDRW Combo Drive 12.1" XGA TFT ATI Mobility Radeon 16MB Integrated 10/100 Mbps LAN Integrated Intel Pro Wireless 2200BG 802.11bg MiniPCI Integrated 56k Modem 8-Cell Lithium Ion Battery - Battery Life 5.0hrs* (approx) Weight 1.64kg (approx) X3 Ultrabase External USB Mouse Carrying Case 3-yr International Warranty** 6-mth Insurance 2) Category 2: IBM ThinkPad T41 (PM 1.6GHz) Intel Pentium M 1.6GHz Intel 855PM Chipset 256MB DDR 266MHz (1 x 256MB, max 2048MB) 40GB HDD (5400rpm) 8X / 24X / 10X / 24X DVD/CDRW Combo Drive 14.1" XGA TFT Active Hard Disk Protection 32MB Video Ram Integrated Gigabit LAN Integrated Intel Pro Wireless 2200BG 802.11bg MiniPCI Integrated 56k Modem 6-Cell Lithium Ion Battery - Battery Life 5.5hrs* (approx) Weight 2.2kg (approx) External USB Mouse Carrying Case 3-yr International Warranty*** 6-mth Insurance 3) Category 3: IBM ThinkPad R51 (PM 1.5GHz) Intel Pentium M 1.5GHz Intel 855PM Chipset 256 MB DDR 266MHz (1 x 256MB max 1024MB) 40GB HDD (5400rpm) 8X / 24X / 10X / 24X DVD/CDRW Combo Drive 14.1" XGA TFT ATI Mobility Radeon 32MB Integrated 10/100 Mbps LAN Integrated Intel Pro Wireless 2200BG 802.11bg MiniPCI Integrated 56k Modem 8-Cell Lithium Ion Battery - Battery Life 5.7hrs* (approx) Weight 2.8kg (approx) External USB Mouse Carrying Case 3-yr International Warranty** 6-mth Insurance + All prices are subjected to 5% GST. * Actual battery life may vary depending on use, configuration and system load. ** For X31 and R51, battery 1st year international, 2nd and 3rd year local. All other parts 3-year international warranty. *** For T41, battery 1st year international. All other parts 3-year international warranty.