Check the listing for details. [ Whadda Velleman WMI167 ] Mini USB Interface Board. Condition: New. Listed at 39.95 USD. Use your PC to connect to the outside World"Test software and examples downloadable via www.velleman.eu !Features: very Small, universal USB powered & controlled I/O board !add USB interface to existing equipment15 inputs / outputs, including analogue inputs / digital inputs/outputs and PWM outputsthe number of inputs/outputs can be further expanded by connecting two cards to the PC's USB connectorsall communication routines are contained in a Dynamic Link Library (DLL) Specifications:5 x analogue 10 bit resolution inputs: 0…5V / (30K)8 x digital 5V inputs/outputs with on-board LED indication: Input/output mode is selectable in groups of 4 terminals1 x 32 bit pulse counter up to 1MHz input frequency2 x 8 bit 5V PWM outputs: 0 to 100%on-board LED indication for I/O and PWM outputsoutput current, PWM: 10mA / Digital outputs: 6mAup to 2 cards can be connected to one PCUSB port: USB 1.1 & 2.0 compatibleDLL supports Windows XP, Windows Vista and Windows 7*PWM frequency selection: 2930Hz,11.7kHz or 46.9kHzcommand execution time, read:read: 4mswrite: 1mspower consumption through USB port: approx. 50mA Dimensions: 68 x 40 mm / 2.7 x 1.6"