10 Electricity-Free iPhone Speakers

Bike Horn iPhone Speaker

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bike horn speaker

credit: lowtechatmo

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Another great speaker that upcycles old materials is this bike horn version that resembles a mini victrola. This DIY project by Flickr user lowtechatmo, comes together by removing the noise maker from an old horn and then fastening it to a piece of PVC. The weight of the horn keeps the iPhone standing up while perfectly projecting your tunes. Genius!