MB Pro 2 UC ML 506046 Certified for Skype for Business, MB Pro 1 UC ML and MB Pro 2 UC ML are premium Bluetooth® headsets for UC business professionals who demand wireless communication freedom, brilliant sound quality, and exceptional wearing comfort. Specifications: Wearing style Headband Frequency response (microphone) 150 Hz - 6,800 Hz Frequency response (headphones) 150 Hz - 15,000 Hz Microphone Ultra noise-cancelling Sound pressure level (SPL) Max. 118dB (SPL) limited by ActiveGard® Weight 82g / 2.89 oz Charging time 2h 30min (50% in 40min) Technology Bluetooth® Version 4.0 / supported profiles: HSP 1.2, HFP 1.6, A2DP 1.2 Range Up to 25 m / 82 ft Talk time Up to 15h Speaker type Dynamic, neodymium magnet Included in the box: Headset Dongle USB charging stand Safety guide InCompliance leaflet Quick guide