Compact Secure Fit Design. Designed and tested for a secure fit, A smaller & lightweight earbud design for wearing comfort and stability, whether you’re running or dancing to your favorite tunes. Pass one earphone to a friend to enjoy a song together and bounce along to the beat. Power up to power on, open the charging case to steady connect to any Bluetooth enabled devices in seconds. Take full control of your calls and music with single intuitive button control. One key to volume, tracks, turn on & off control.