Type - Headphone Amplifier Inputs - 1 x power supply (optional)   Inputs -  1 x 3.5mm audio Inputs -  1 x RCA/PHONO Line level Outputs - 1 x stereo RCA (variable)                    1 x 6.3mm stereo headphone socket Power supply requirement - 12 to 15Volts DC Headphone output impedance - 25 to 300 Ohms Line out minimum impedance - 1 K Ohms Line Out Voltage - 2Vrms max Power Output - 4W max Output Impedance - < 0.5 Ohms Housing - Full metal galvanised body Colour - Black fascia Dimensions - 185mm W x 55mm H x 175mm D Packed Weight - 1.6Kg