Each pair of Troubadours is individually handcrafted from real, reclaimed wood. No two pairs are exactly alike. And, for each pair sold, LSTN helps restore hearing to a person in need through the Starkey Hearing Foundation.Materials: Reclaimed wood; available in ebony, cherry, zebra, or beech woodPlush ear cups for long term useUnpluggable, wood enclosed, gold plated plugsIn-line microphoneDurable, nylon-wrapped cablesWith every pair of headphones you purchase, LSTN will restore hearing to a person in need through the Starkey FoundationWorks with iPhones, iPods, iPads, Androids, Blackberry, CD, DVD, radios, and stereos with standard 3.5mm headphone jacksDrawstring, woven carrying bag to protect from scratchesFrequency response: 18Hz 22KHzSensitivity: 101+/-3dB At 1KHz1mWImpedance: 32 OhmR&L balance