At home or in the office, the PC 21-II headset has been designed for easy internet-based calls. Its single-sided wearing style lets you enjoy the conversation while being in touch with what’s going on around you. & the lightweight, adjustable headband is comfortable to wear all day long. To help make sure you’re understood, the PC 21-II features an enhanced noise canceling microphone that reduces background noise – & makes the headset extra good when you’re using speech recognition applications. As an added feature, the microphone boom arm is extremely flexible, so that you can easily adjust it to sit any way you like. Features Sennheiser sound – a quality speaker delivers great acoustic performance, so you’ll always hear what’s being said Noise canceling clarity – the microphone filters out ambient noise, so your voice is always clear & easy to understand Reliable speech recognition – the microphone is specially designed for your device’s speech recognition function Keep one ear free – the single-sided design keeps you in touch with your surroundings while you talk over the net Fully flexible boom arm – adjust the microphone for optimal voice pick-up & comfort Light & comfortable – with the lightweight headb&, it’s easy to forget you are even wearing a headset