Velleman-USB (Universal Serial Bus)-Interface-Card-Velleman-VM110N-p-The-Velleman-USB (Universal Serial Bus)-Experiment-Interface-Board-has-5-digital-input-channels-&-8-digital-output-channels-plus-two-analogue-inputs-&-two-analogue-outputs-with-8-bit-resolution-The-number-of-inputs-outputs-can-be-further-expanded-by-connecting-up-to-4-more-cards-to-the-PC-s-USB (Universal Serial Bus)-connectors-All-communication-routines-are-contained-in-a-Dynamic-Link-Library-DLL-You-may-write-custom-Windows-XP-Vista-Windows 7-applications-in-Delphi-Visual-Bas