Linksys USB VPN & Firewall Adapter, Windows 98SE, Me, 2000, XP, IPSec 56-bit DES, 168-bit 3DES, 0 - 40 °C, -20 - 70 °C, 10 - 85%, 5 - 90% Linksys USB VPN & Firewall Adapter. Compatible operating systems: Windows 98SE, Me, 2000, XP. Firewall security: IPSec 56-bit DES, 168-bit 3DES. Dimensions (WxDxH): 4.72 x 0.591 x 2.52" (120 x 15 x 64 mm), Weight: 2.47 oz (70 g). Minimum RAM: 64 MB, Minimum processor: 200 MHz. Interface: USB, Minimum system requirements: Internet Explorer 4.0 / Netscape Navigator 4.7 CD-ROM USB, Power requirements: 500mA