High End Premium Bluetooth in ear headphones Developed in Germany Premium Design by DWX Thiele 9,2 mm Klippel® optimized Laser Tech Driver High-precision stereo amplifier- Bluetooth 4.1 Noise isolation ear-tips in three sizes High quality surfaces Extremely comfortable to wear due to optimized ergonomics Rechargeable Lithium-ion battery for up to 8 hours Bluetooth® operation (volume, play/pause, next/last track, phone) Premium flat cable with integrated remote control Wind-protected microphone for hands-free telephone operation Impedance 16 Ω Sound pressure (1 khz, 1vrms) 115 db Frequency response 17 – 23.000 Hz