On-ear design ensures these headphones are comfortable and fit securely Wireless Bluetooth connectivity means this headset can be connect to your mobile device, while the Bt700 USB adaptor allows you to connect it to your PC Active noise cancellation ensures that all you hear is what you are listening to Intelligent microphone boom maintains left and right audio automatically, no matter which side you wear the headset on Compatible for use with Siri Smart sensors allow you to answer and mute calls, or play and pause music Dynamic Mute Alert lets you know if you are talking while on mute Adjustable headband, paired with ear cushions that are covered with faux leather, provide maximum all-day comfort Onboard lithium-ion battery offers up to 21 hours of talk time or up to 24 hours of listening time with a full charge On-Call light lets others know not to disturb you