AIAIAI Pipe Earphone is a simple, more delicate and organic design than preceding models. Sound quality is fine tuned by C4 Studios Offering full-spectrum sound from the deepest bass to high-frequency tones, the sleeves are designed to deliver external noise reduction for clearer sound at safer volume levels. A choice of soft-foam or latex, the earphones are designed for in-ear comfort and full grip. AIAIAI earphones come with three sets of sleeves included for more individual accurate fit and external noise reduction. Driver unit size: 9 mm Impedance: 16 ohm Sensitivity: 106dB/mW at 1K Hz Frequency Respons: 20-20K Hz Rated power input: 4 mW Maximum power input: 20 mW compatibility: Ipod