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The Velleman VM140 Extended USB Interface Board allows you to connect multiple devices via USB and control them from your computer. With a total of 33 inputs and outputs, including analogue, digital and a pwm specific output, the VM140 Extended USB Interface Board allows you to connect sensors, relays, stepping motors and so much more! Damaging your computer is impossible with the galvanically and optically isolated USB connection â ensuring a high level of secure implementation. All communication routines are contained in the dynamic link library (.dll). You can even create custom Windows applications in Borland Delphi, Borland C++ Builder, Microsoft Visual Basic, Microsoft VC or most other 32-bit Windows application development tools that support calls to a dynamic link library. *Windows XP is a registered trademark of Microsoft Corporation.