ZAGG Travel Friendly Wood Headphones - Bamboo All wood ear cup housing delivers natural audio reproduction Detachable cords for storage and transport Foldable design for convenient travel Speaker size: 40mm / Frequency response: 18Hz-22KHz / Sensitivity: 101+/-3dB At 1KHz1mW / Impedance: 32 Ohm / R&L balance&lt; 3dB(50Hz-6KHz 1mW) Rated input power: 10mW / Maximum input power: 20mW / Cable: length 1.2m TPE Material / Plug: 3.5mm gold-plate