Model Name: PS2000e Specifications: - Transducer Type: Dynamic - Operating Principle: Open Air - Frequency Response: 5 - 50,000 Hz - SPL 1mW: 99.8 dB - Nominal Impedance: 32 ohms - Driver Matche dB: .05 dB Includes: - Headphones - Warranty - Grado story-sheet - 3.5mm mini adapter - extension cable - A 4-pin XLR balance cable option is available