V-Moda VAMP for the iPhone: an analog converter and headphone amp with a $650 pricetag – engadget

The 2200 mAh lithium-ion battery can be used as a backup power source for the iPhone 4/4S, virtually doubling its battery life. Another unique feature is an Optical audio output that allows you to connect VAMP to your A/V receiver or DJ mixer ...
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