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Give your iPhone 4 GPS, podcasts, and phone calls a sound boost. The built-in amplification system in the SoundWave 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. iPhone 4 compatible.