Sony MDR-W14L

Vertical In-The-Ear Design reduces size and weight to the bare minimum, comfortable hour after hour
Wide Headband for broader weight distribution, greater comfort
13.5 MM Diameter Driver is small enough to fit inside your ear
Neodymium Magnet for maximum energy in minimum size; Neodymium is comparably more powerful than conventional Samarium Cobalt or Aluminum magnets
Sony Acoustic Twin Turbo Circuit for high efficiency, gets high sonic output from your portable stereo; extends bass down to 18 Hz
Nickel-Plated Mini-Plug resists corrosion for high conductivity, low noise Type: Vertical, In-the-Ear, Open air, dynamic
Driver Unit: 13.5mm diameter
Magnet: Neodymium
Headband: Wide
Cord: TPC; Y-shaped, 3.3 ft (1.0m)
Plug: Nickel-plated
Stereo Mini Plug
L-shaped
Impedance: 16 ohms
Sensitivity: 104dB/mW
Power Handling Capacity: 50mW
Frequency Response: 18 to 22,000 Hz