Connected to: PC via USB/USB-C, connects to mobile devices and tablets via 3.5 mm and devices that support USB-CCompatible with: Windows® or Mac OSIdeal for: Users transitioning to PC telephony for webinars, conference calls, music, and other multimedia applications Hearing Protection: SoundGuard: Acoustic limiting for protection against sounds above 118 dBARemote Call Control: Call answer/ignore/end/hold, redial, mute, volume +/-Tech Specs:* Dynamic EQ, microphone frequency response 100 Hz–10 kHz* Hi-fi stereo (C3220/ C3225)* Receive output from 20 Hz–20 kHz* Enhanced digital signal processing (DSP)* Noise-canceling microphone