Boasting an enviable range of attractive and innovative Sennheiser technologies, this single headset allows users who demand flexible yet fail-safe wireless solutions to perform at their best. Features Unique Premium Design Crafted for comfort High Comfort Wearing Style Perfect adjustment to your ear for a full day wearing comfort Intuitive User Interface Mute microphone and adjust volume up or down Boosted Productivity Ultra noise-canceling microphone filters out unwanted background noise Sennheiser HD Voice Clarity Wideband sound for a more natural experience Full Workday Talk Time 8 hours in wideband sound mode and 12 hours in narrowband sound mode Intelligent Fast Charging 50% in 20 minutes gives you 4 hours talk time Long Distance Wireless Range Up to 55 m in typical office building. Up to 180 m in line of sight Protected Hearing ActiveGard technology protects against acoustic shock and sudden sound surges Desk Phone & Softphone Switch from one communication channel to the other. One touch on the base station to select the channel you wish to call from Intuitive & Easy pairing For desk sharing and phone conferencing GAP compatible (Headset) Headset: Connect to base Base Station: Connect to desk phone and softphone Microsoft Communicator compatible