Hope you've got plenty of light if you want to run these wireless, solar powered speakers. (Alternatively, you can just plug them in, but where's the fun in that?) The speakers themselves are rated to have a 5-watt power output, so don't expect to be turning them up to 11 any time soon. That said, the wireless is supposed to have a range of up to 50 meters (164 feet in real measurement terms), so this isn't a complete gimmicky piece of garbage. The speakers are also encased in a weatherproof exoskeleton of doom, so they can safely be used outdoors for the most part.
So if you've got a hankering for some wireless speakers that'll work with your myriad audio devices, be prepared to spend around $150. Mind the limited supply, however.