Power Consumption: USB < 200mA, Transceiver, < 100mA @ 13.8V. 
Radio Port: RxD, TxD, max. 57600 Baud
Levels: jumper selectable TTL, inverted TTL, open collector bus or RS-232
CW: open collector, driven from DTR or audio detector, max 30V/400mA
PTT: open collector, driven from RTS, max 30V/400mA
FSK: open collector, driven from DTR (MMTTY with EXTFSK) or 
       audio detector (FLDIGI/pseudo-FSK)
SQL: input, closed to ground or high (two inputs) to activate. Wired to CTS
Audio Out (left): 
     Output Level: 1.3V p-p max. 
     Response:  100 Hz - 10 KHz +1dB/-3dB 
     Second Harmonic:  -80 dB (typical) 
     Third Harmonic:  -70 dB (typical) 
     D/A Sample rates: 32000, 44100, 48000 Hz 
Audio Out (right): 
     Internal Pseudo-FSK/QSK CW detector.
     drives CW and FSK outputs
Audio In (left): 
     Input Level: 4V p-p max. 
     Response:  300 Hz - 3 KHz +/- .5 dB (typical) 
     Absolute Noise Floor:  -90 dB @ 600 Ohms  
     Dynamic Range:  87 dB (typical) 
     D/A Sample rates: 8000, 11025, 16000, 22050, 32000, 44100, 48000 Hz 
Dimensions: W 103mm (4 1/8") x H 28mm (1 1/8") x D 101mm (4")
Weight: 1100 g (2.4 lbs.)
Under Microsoft Windows, the microHAM USB Device Router can create/map the USB III to separate virtual serial ports for control, CW, and PTT.  With OS X and LINUX the control, software CW and PTT outputs are provided as a single TTY device using native FTDI drivers for that operating system.  The USB sound card uses OS native USB Audio Class drivers built-in OS.
Minimum - 800 MHz IBM PC compatible computer with Windows 2000, 64 MB RAM, CD-ROM, USB1.1 port, Transceiver, logger or control software (any) 
Recommended - 1.6 GHz PC with Windows XP or higher, 256MB RAM, CD-ROM, USB2.0 port, Transceiver with computer port, logger or control software (any)
Also Supported - Apple G4 or later with OS X 10.4 or later and current LINUX distributions. 

Note:  Windows 98 (any version) is not supported.