The Fitbit Flyer Wireless Headphones are designed to be used whilst working out and boast several great features that will get you moving. - Premium wireless sound, enhanced by Waves technology - Personalised fit for comfort and security - Durable and sweat proof, so you can work wear them all day and for your work outs - 3 button control box for keeping track of your music and call controls - The dual microphone delivers high-quality calls - The battery lasts up to 6 hours with the ability to quick charge - You can easily connect and switch to the Fitbit Ionic and other bluetooth enabled devices