Use this on your PC or in the field on your PDA. The programme contains 567 detailed species pages and illustrations of plumage, distribution ranges, colour photos and sounds plus a comprehensive guide to the best birding sites. A great product. System requirements PC - Pentium 2-300 or better, 128 MB RAM, Windows 98 to XP, 600MB hard disk space. PDA - Windows Pocket PC 2002 or later. 128 MB SD card.