Arcam MusicBoost Headphone AMP/DAC Battery Pack Sleeve (iPhone 6 Only - Phone Not Included) Fully recharges the iPhone 6 battery with up to 120% extra battery life High precision DAC with dedicated headphone amplifier for high quality sound Soft touch sleeve to help protect your iPhone 6 Supplied with a micro USB cable that can charge both the MusicBOOST & iPhone and sync the iPhone Supports only the iPhone 6