Electrical Operation Voltage Typical +DC 5V, +4.75V to +5.25V Size under 52 inch(include 52)USB or PS/2 Interface, power ripple max.200mV Power Supply rms Size above 52 inch (52 not included): external AC-DC power adaptor Interface Full Duplex USB 2.0 (Full Speed) Plug and play, Free driver Serial RS-232. Baud Rate: 9600, 8 Data Bits, 1 Stop Bit, No Parity Current Typical 150MA@+5VDC; 350mA, ...