As far as iphone cases go, the V-Moda Vamp more than gets the job done. The V-Moda Vamp is not primarily an iPhone case, though. Its main function is to increase and improve the power of your iPhone’s audio capabilities. Its brushed metal and silicone construction renders it an acceptable protective case, and its lithium-ion battery serves as a backup battery for your iPhone.
V-MODA VAMP Headphone Amplifier 
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