12 W pass-through charging powers up your iOS device at maximum speed. So, whether you're listening to music or watching videos, using audio navigation, or taking calls while you charge, there's nothing slowing you down. The Belkin F8J212 supports any audio jack using the 3.5mm connector with up to 48 kHz, 24-bit audio output for clear conversations and flawless music playback. There's no need to remove your iPhone or iPad case to connect your 3.5mm headphones or your charging cable, since the Belkin F8J212 works with most cases.