THE DEMO UNIT IS IN PERFECT OPERATING CONDITION. SALES ON DEMO UNITS ARE FINAL AND CANNOT BE RETURNED. PACKAGING & ACCESSORIES MAY NOT BE AVAILABLE. NO WARRANTY. VX is the qdc previous flagship, which is a 10-driver headphone. VX is a kind of nerve poison that is more fatal than Sarin in the military. VX is one of the deadliest chemical weapons. Thus, VX is an “overwhelming” in-ear headphone. Different from the previous Anole, VX has 3 tuning switches, switch 1, 2, and 3 are low, medium and high frequency respectively, which can be adjusted alone, and playing method jumps from 4 tuning types to 8. Remarks: VX standard model is only available in one option. Specifications Sensitivity: 110-113dB SPL/mW Frequency response: 10Hz-20000Hz Impedance: 15-19Ω DCR: 15-19Ω Armature units: 10 micro balanced armature Noise isolation: 26dB Monitor plug: 3.5mm(1/8") connector Cable: optional Technical feature: 3 sound channels, 3 crossovers, natural restoring, superb music quality