It’s structured for intuitive use and the only way of controlling it is the giant dial on top. The Vol speaker is portable, so you can take it anywhere, . You use it to switch it on and off. While also using it to adjust the volume, while it looks a lot like the Griffin PowerMate, the Vol differentiates itself by having a speaker built in, if produced, the USB rechargeable speaker will be made out of aluminum, measures just 2.2 inches in diameter and 1.4 inches in height.
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