The Montblanc MB 01 Over-Ear Headphones are our answer to clients' growing expectation of comfortable companions for longer meeting days, sound quality and a haptic experience. Their combination of leather, comfortable cushions and contemporary headphone technology allows users to master a full day of calls, relax while listening to their favorite tunes or focus with Active Noise Cancellation. Technology Sensors Proximity Sensor (automatically plays/pauses audio when putting the headphones on/off) Connectivity Bluetooth 5.0 (Multipoint, 10m range), Wireless and Wired. Connectivity to Smartwatch. Buttons On/Off Switch, Volume, Pause/Next/Previous, ANC Button, Assistant Button. Others Frequency 70Hz ~ 18kHz from 1kHz SPL down 10dB | Impedance 21 Ω ± 10 % at 1kHz | Sensitivity 104.3 ± 2.5 dB at 1mW/1kHz open field | THD Less than 1% at 1mW/1kHz | adaptive aptX and AAC codecs In the box Headphones, pouch, jack cable, USB cable, airline adapter