The 3.5 mm Audio + Charge RockStar allows you to use your headphones while charging your iPhone. Just connect your 3.5 mm headphones speakers or AUX cable (aka AUX cord) to enjoy music or talk hands free while you charge. Use the 3.5 mm RockStar at home at work in the car or on the go.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;DUAL FUNCTIONALITY&lt;/b&gt;&lt;br /&gt;Pass-through charging powers up your iOS device at maximum speed. So whether youre listening to music watching videos using audio navigation or taking calls while you charge theres nothing slowing you down.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;UNCOMPROMISED AUDIO QUALITY&lt;/b&gt;&lt;br /&gt;Get more out of your iPhone listening experience. The 3.5 mm Audio + Charge RockStar is certified to meet Apple specifications and uniquely designed to ensure clear and crisp audio.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;SYNC STAR&lt;/b&gt;&lt;br /&gt;Use the RockStar to connect your iPhone to a laptop and access music while you sync.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;&quot;MADE FOR iPHONE&quot;&lt;/b&gt;&lt;br /&gt;&quot;Made for iPhone&quot; means that an electronic accessory has been designed to connect specifically to iPhone and has been certified by the developer to meet Apple specifications.&lt;br /&gt;&lt;br /&gt;- Listen to 3.5 mm audio and charge at the same time&lt;br /&gt;- Supports optimal pass-through charging for iPhone&lt;br /&gt;- Supports remote control and microphone from MFi-certified 3.5 mm headphones&lt;br /&gt;- Supports syncing to transfer data to your laptop&lt;br /&gt;- Works with Apple iPhone 7 Smart Battery Case&lt;br /&gt;- Made for iPhone