Give your iPhone 4 GPS, podcasts, and phone calls a sound boost while you"re delivering a fresh charge! The built-in amplification system in the SoundWave(TM) Sound Amplifying Car Mount doubles the volume coming from your iPhone speaker, making it easier to hear your turn-by-turn directions, calls and more. The cradle mounts in seconds to the windshield or vent and holds your iPhone securely-even when in a case-on the roughest terrain. And, you can charge your iPhone or iPod at the same time, while you"re behind the wheel, with an ultra-low profile design charger that blends nicely into any car´s interior. There"s even a detachable cable for charging and syncing from your home computer.