DAC Transmitter - portable, with headphone amplifier, powered by battery or USB, digital USB input, analogue input, headphone and line analogue output, all-metal body, frequency range of 20 - 20.000Hz, converter: 24bit/96kHz, output power: 190mW (32Ohm) 75mW (150Ohm), signal/noise ratio> 107dB, THD + N 0.005% (1kHz), headphone impedance: 16-150Ohm, crosstalk> 75dB, 1 kHz) Gain -7/4.5 dB (AUX) -3.5 / 8dB (USB), output level 7.2 Vs, battery operating time> 30 hours, charging time <4 hours, output impedance <0.3Ohm (headphone), channel difference: 0.2 dB, bass boost: 0/5dB