The ATH-AR1iS is light weighted & miniaturization with powerful sound and offers richly detailed sound in a compact foldable design Features - Equipped with newly designed 40 mm drivers that reproduce clear mid- and high-frequency sound as well as powerful low-frequency sounds - The top-mounted PCB design allows smooth movement of the diaphragm to reduce distortion and deliver high-quality audio - Foldable design for easy portability - Lightweight design for comfortable extended use - Compact on-ear design Specification - Type : Dynamic - Driver : 40mm - Frequency Response : 5 – 30,000 Hz - Maximum Input Power : 1000 mW - Output Sound : 103 dB/mW - Impedance : 47Ω - Plug : 3.5mm gold-plated stereo mini-plug - Microphone Element : Electric Condenser - Microphone Polar Pattern : Omnidirectional - Microphone Sensitivity : -44 dB（0 dB = 1 V/Pa, 1 kHz） - Microphone Frequency Response : 50 to 4,000 Hz