Speechline series Suitable for all Sennheiser 3-pole gooseneck microphones Transmission range: 75 - 20,000 Hz Wireless charging via Qi Charging or via USB Up to 10 hours of battery life Remote control and monitoring with Sennheiser Cockpit Control 3 Pole XLR in / out Micro USB socket On / Off / Mute switch with status LED Frequency range: 1880 - 1900 MHz Worldwide registration and free of charge operation CHG2W charging base sold separately (not included) Dimensions: 166.7 x 120.2 x 47.9 mm Including battery and instructions