Fully adjustable headband. 180-degree pivoting speakers. Connects to PC via USB, connects to mobile devices and tablets via 3.5 mm. Compatible with Windows® or Mac OS. Dynamic EQ optimized for PC wideband voice telephony up to 6.8kHz or for multimedia 20Hz to 20KHz. Acoustic limiting for protection against sounds above 118 dBA. G616 support limits the level to 102 dBSPL. Flexible noise canceling microphone. Pc Audio microphone frequency response : 100Hz to 10kHz optimized for PC wideband audio up to 6.8kHz. Remote call control. Call answer/ignore/end/hold, redial, mute, volume +/-.