I'm selling few months old Ferrum OOR headphone amplifier. Like new condition, original double package. Shipping from the EU.

• Gain (dB): Balanced -4 dB, + 6dB, +16 dB / single ended -10 dB, 0 dB, 10 dB
• Operation: Fully balanced, proprietary discrete power amp technology
• Inputs: XLR, RCA, 2.5 mm DC connector centre positive, proprietary 4-pin DC connector
• Outputs: Balanced 4-pin XLR, 6.35 mm jack
• Frequency Response: 20 Hz – 100 kHz 0.1 dB
• Output Power Single Ended: 400 mW into 300 Ω, 2 W into 60 Ω
• Output Power Balanced: 1.600 mW into 300 Ω, 8 W into 60 Ω
• THD on balanced output: 0.00011% / -119 dB, 1 mW into 50 Ω; 0.00028% / -111 dB, 100 mW into 50 Ω
• THD on unbalanced output: 0.00008% / -122 dB, 1 mW into 50 Ω; 0.00028% / -111 dB, 100 mW into 50 Ω
• Dynamic range: 130 dB (A-weighted)
• Input Impedance: 94 kΩ
• Output Impedance Single Ended: 22 Ω on pre-amp
• Output Impedance Balanced: 44 Ω on pre-amp
• Output headphones Impedance: < 0.3 Ω
• Power Consumption: Idle <15 W
• Power Adapter: 100/240 V AC to 22-30 V DC
• Dimension (W x D x H) (In/cm): 8.6 x 8.1 x 2.0 inch / 21.7 x 20.6 x 5 cm
• Weight (kg/lbs): 1.8 kg / 3.97 LBS