Logitech UE Bluetooth Speaker
The Logitech UE Mobile Boombox is a small portable Bluetooth speaker that boosts the iPhone 5s' sound to levels better suited for rocking out in an office, during a shower or while working outside.
The small Bluetooth speaker sounds very good and can double as a speakerphone for calls when a smartphone isn't loud enough. The battery life is good, though it won't tell you the level until it is too low.
$80 at Amazon
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