Dynamic in-ear headphones. Featuring an ultra-compact, noise isolating design and lightweight, aluminium alloy construction the S500i uses micro dynamic driver technology to deliver exciting, immersive and detailed sound reproduction. 3-button remote and microphone for use with compatible Apple devices. 1.35m, two part material cable with gold plated connection. Carry pouch included. Frequency range: 16 Hz - 22 kHz. Sensitivity: 100 dB. Impedance: 16 Ohm.