Features The device must be powered by 12 VDC to work. There is no protection against reverse voltage. If VCC (+12V) and GND are interchanged, the board will be damaged. There is no protection against reverse voltage. If VCC (+12V) and GND are interchanged, the board will be damaged. The board cannot work without a computer. When the board is connected to the PC and the PC is restarted, the relays are switched several times. This is due to the structure of the FTDI chip. Additional PCB openings for better voltage insulation. Double high current tracks. Specifications: Relay: 10A 250VAC/10A 125VAC/10A 30VDC/10A 28VDC. Power supply: 12 VDC Power consumption: 300 mA. Size: 93 x 70 x 16 mm/3.66 x 2.75 x 0.63 inches. Software examples: VB6, BCB6, Java (Netbeans), VB.NET 2010 Expresses, C++.NET 2010 Expresses PCBs: FR4/1.5mm/Two Layers/Metalized Holes/White Stamp/Solder Stop Paint Features: Additional PCB openings for better voltage insulation. Double high current tracks. When the board is connected to the PC and the PC is restarted, the relays are switched several times. This is due to the structure of the FTDI chip. The device must be powered by 12 VDC to work. There is no protection against reverse voltage. If VCC (+12V) and GND are interchanged, the board will be damaged. The board cannot work without a computer. Package includes: 1 x 8-channel 12V USB relay board. Package List