What's upgraded from the model PR3 and previous planar? 

• Damper Structure Optimization: Significantly reduces sibilance for a smoother
  listening experience.
• Acoustics graph improved: Delivers a more expansive and natural soundstage
• Magnetic Circuit Enhancement in Driver: Increases sound density, providing
  richer and fuller

Specification

• Impedance：15±3Ω
• Sensitivity：94±3dB
• Frequency : 20-40000Hz
• Plug: 3.5MM
• Pin:  0.75MM
• Cable type: silver-plated cable
• Cable length: 120±5cm