The computer uses Complementary Metal-Oxide Semiconductor (CMOS) technology extensively to provide compact size, minimum weight, low power usage, and high reliability. This computer incorporates the following features and benefits: Processor The computer is equipped with a Mobile Intel Mobile Pentium® 4 Processor - M, which incorporates a math co-processor and a 20 KB cache memory and uses Enhanced Intel® SpeedStep™ technology. 1.40 GHz Mobile Intel® Mobile Pentium® 4 processor - M 1.40 GHz 1.50 GHz Mobile Intel® Mobile Pentium® 4 processor - M 1.50 GHz 1.70 GHz Mobile Intel® Mobile Pentium® 4 processor - M 1.70 GHz Other processors may be offered in the future. Memory Slots 128 or 256 MB memory modules can be installed in the two memory slots for a maximum of 512 MB system memory. Level 2 cache A 512 KB level 2 cache maximises performance. Video RAM 16 MB of RAM is provided for video display. Power Battery pack The computer is powered by a rechargeable lithium-ion battery pack(s). A main battery is installed from factory side, and an optional Secondary battery can be installed in the Slim SelectBay. RTC battery The internal RTC battery backs up the Real Time Clock (RTC) and calendar. AC adaptor The universal AC adaptor provides power to the system and recharges the batteries when they are low. It comes with a detachable power cord. Because it is universal, it can receive a range of AC voltage between 100 and 240 volts.