Plantronics SAVI W440 Convertible, Wireless DECT Headset System for Laptop, Softphone & Multimedia Use - Black & Silver Lightest DECT wireless convertible headset with noise cancelling mic to filter out background noise Multitask handsfree up to 300 feet from base Hot swappable battery for unlimited talk time One-touch call answer/end volume +/- mute and flash with supported softphones Voice dedicated DECT technology eliminates W-Fi interference