it is the portable wireless server - Physical Dimensions : 112mm x 77mm x 22mm Weight: 230g (with battery) Wireless Interface Standard: IEEE-802.11b & 802.11g Standards Frequency Band: 2.4GHz – 2.4835GHz ISM BW Modulation Technology: 802.11b: CCK, DQPSK, DBPSK; 802.11g: OFDM Data rate: Up to 54Mbps Mode: Ad-Hoc or Infrastructure Range: Up to 30m Security Features Wired Equivalent Privacy (WEP) 64-bit and 128-bit encryption Username and Password Protected Access Internal HDD Storage Capacity: 20GB/40GB/60GB/User Determined Form Factor: 1.8” HDD or 2.5” HDD Interface: IDE/ATA LED Indicators & Switches HDD Activity and Power/Charging/Critical Power Indication Button/Switch: Power On/Off, Ad-Hoc/Infrastructure Selection Power Battery : Li-Ion Usage hours: 2 hours (Continuous Access) Charging time: 3 hours Charging Adaptor: 110/240VAC, 50/60Hz Input, 5VDC Output System Requirements Windows 2000 or XP Pentium III or higher with 128MB RAM IEEE-802.11b/g Interface Environment Operating temperatures: 5 to 40 C Storage temperatures: -10 to 50C Relative humidity: 5% to 90% Shock operational: 300G or less (2ms, half sine wave) Non-operational: 1000G or less (1ms, half sine wave) Shock operational: 300G or less (2ms, half sine wave) Non-operational: 1000G or less (1ms, half sine wave)