Navilock NL-464US. Form factor: Wireless Receiver Module, Acquisition times - cold: 42 s, Acquisition times - warm: 38 s. Weight: 20 g, Width: 65.5 mm, Depth: 23 mm. Operating temperature range (T-T): -20 - 70 °C, Storage temperature range (T-T): -20 - 80 °C. Minimum processor: Pentium III, 500MHz, Minimum RAM: 128 MB, Minimum hard disk space: 50 MB. Interface: USB, Compatible operating systems: Windows 98/Me/2000/XP/Vista/7 Linux RedHat 7.3/8.0/9.0 Mac 8/9/10.x, Power requirements: 5V