The 4100 is the first school-focused headset to feature a USB plug and also the first to offer single To Go plug compatibility with MAC and Windows-based computers as well as iOS and Android-based smartphones and tablets.This state-of-the-art headset is as comfortable a model as you'll find with cushiony earpads and a comfort-sling headband to evenly distribute its weight, making it sought after for when a headset needs to be worn for extended periods of time.Plug and play - eliminates the need for a sound cardWindows/Mac compatibleIn-line mute/volume control on the 4100-USB model only (the volume for the 4100AVT is controlled from the device)ABS plastic earcups and headband for durabilityAdjustable comfort sling fits all sizesFlexible boom microphone for language applicationsReinforced strain relief connector won't pull out