Eton's Rukus XL is a solar-powered, absurdly loud, Bluetooth-enabled boombox. Though quick to avoid the older "boombox" moniker, Eton's marketing chief referred to the Rukus XL as a "portable sound system." It doesn't quite roll off the tongue but, then again, it isn't the '90s anymore. The Rukus XL takes about five hours to charge in direct sunlight and, laudably, will last about eight hours on a full charge. Smartly, it also lets users charge the smartphone that's providing the tunes. The Rukus XL costs $200.