Kensington K39255US SoundWave Sound-Amplifying Car Mount--Compatible with iPhone 4-Black Acoustically amplifies iPhone sound for twice the volume with no added battery drain (including iPhone 4) Cradle securely holds your iPhone even when in a case Flexible arms let you insert and remove your iPhone with one hand Cradle pivots for both landscape and portrait modes Includes both windshield and vent mount-use the one that works best for your vehicle