... Type: Built-in lithium-ion batteryStandby time:500-700 hoursTransmit Power: Max+4 dBmOperating Voltage : 3.3 VOperating Current: <80mACharge ... Redhat-9.0, Ubuntu-8.10 Fedora-7.0 tested)Power duration: 5 hoursLarge PAD for handwrite, Built-in lecture ... , scroll, and the mouse click actionBuilt-in rechargeable more staying power lithium-ion batteryInnovative design of the Navigation keys, convenient and ...