Check the listing for details. National Instruments USB-6501 Data Acquisition Card, NI DAQ DIO NEW. Condition: New. Listed at 39.00 USD. Original USB-6501 DAQ Card Data Acquisition Card USB Data Acquisition Board 24 Channels For NIFeatures:- USB-6501 (24 channels, 8.5 mA) USB data acquisition device with unbeatable price- 24 I/O channels; one 32-bit counter- Overvoltage protection, 8.5 mA current drive- Built-in screw terminal or universal 34-pin connector (OEM version)- USB2.0 full-speed (12 Mb/s) bus interface- Convenient bus power supplySpecifications:General:- Product Family: Digital I/O- Measurement Type: Digital- Form Factor: USB- Operating System/Target: For Linux, Mac OS, Pocket PC, and Windows- RoHS Compliant: Yes- Isolation Type: NoneAnalog Input:- Single-ended channel: 0- Differential channel: 0Analog Output:- Number of Channels: 0Digital I/O:- Bidirectional Channels: 24- Input-Only Channels: 0- Output-Only Channels: 0- Timing: Software- Logic Levels: TTL- Programmable Input Filters: Not- Supports Programmable Power-Up States: NotDigital Input:- Input Type: source; drain- Maximum Voltage Range: 0V-5VDigital Output:- Output Type: source; drain- Current Drive Single: 8.5 mA- Current Drive All: 65mA- Maximum Voltage Range: 0V-5VCounters/Timers:- Watchdog Timer: No- Counters: 1- Number of DMA Channels: 0- Buffered Operations: No- Debouncing/Glitch Removal: No- Max Source Frequency: 5MHz- Pulse Generation: No- Size: 32 bits- Timebase Stability: 50 ppm- Logic Levels: TTLPhysical Specifications:- Length: 8.51cm/3.4"- Width: 8.18cm/3.2"- Height: 2.31cm/0.9"- I/O Connector: Screw terminal- USB Power: Bus poweredPackage Included:- 1 x Set of Data Acquisition Card