Arcam MusicBoost Headphone AMP/DAC Battery Pack Sleeve (iPhone 6/6s - Phone not included) Fully recharges the iPhone 6 or iPhone 6s 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 or iPhone 6s Supplied with a micro USB cable that can charge both the MusicBOOST & iPhone and sync the iPhone Supports both the iPhone 6 and iPhone 6s