Features:Whenthe board is connected to the PC and the PC is restarted, the relays will be toggled several times. This is because of the structure of the FTDI chip.The device must be supplied with 12 VDC to work.Extra PCB openings for better voltage isolation.Doubled high current tracks.There is no protection against reversed voltage! If the VCC(+12V) and GND are reversed the board will be damaged.The board can not work without computer.Specifications:Relay: 10A 250VAC/10A 125VAC/10A 30VDC /10A 28VDCPower Supply: 12VDCCurrent Consumption: 300mASize: 93*70*16mm/3.66*2.75*0.63"Software Examples: VB6, BCB6, Java (netbeans), VB.NET 2010 Express, C++.NET 2010 ExpressPCB: FR4/1.5mm/two layers/metalized holes/HAL/white stamp/solder maskPackage Includes:1x 8-channel 12V USB Relay Board