AKG ACCURACY, JUST 3 GRAMS.The AKG® K 350 ear canal headphones tip the scale at just 3 grams. Few headphones weigh less. But the sleek new K 350s deliver highly accurate, high-output sound that few headphones can match - at any weight. K 350s make an ideal upgrade to any portable player, including iPhone devices.Key SpecificationsSystem: Dynamic Design: Closed-back headphones Frequency range: 12Hz to 23.5kHz Sensitivity: 121dB SPL/V Input impedance: 16 ohms Maximum input power: 20mW Net weight (without cable): 3g Cable: 99.99% oxygen-free cable, 1.2m Main connection: Jack plug 3.5mm, hard gold-plated