Armed with a solar panel, the Rukus can play music indefinitely when placed in direct sunlight. Photo: Jim Merithew/Wired. Most Bluetooth speaker boxes have just enough battery life to play one Grateful Dead bootleg. Here's one with enough staying power to make it through every note of the Dead's 1972 European tour.
Eton's Rukus solar boombox harnesses the power of the sun, recharging its battery as it goes. The $150 portable has a lithium ion battery inside, and a 40-square-inch monocrystal solar panel on top.
Gadget Lab, Hands On: Eton's Solar-Powered Bluetooth Boombox
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