... front panel is provided with 3.5mm earphone interface, volume control knob, power switch and an indicating lamp. Channel ... : 1. Full metal material build,durable. 2. With volume control knob. 3. With 3.5mm earphone hole. 4. With ... 5. Wide appication, can comply with most of impedance earphone and speaker. 6. The input of the power ... ) 8. Output noise: <0.1mV 9. Output load impedance: 32ohm 10.Input ...