Model Name: PS500e Specifications: - Transducer Type: Dynamic - Operating Principle: Open Air - Frequency Response: 14 - 29,000 Hz - SPL 1mW: 99.8 dB - Nominal Impedance: 32 ohms - Driver Matched dB: .05 dB Includes: - Headphones - Warranty - Grado story-sheet - 6.5mm Golden Adapter What's in the box 1 x Headphones