Wireless Rechargeable Speaker with Solar OptionIf you are ever stranded on a desert island, you should try to make sure you take the Technical Pro wireless WASP 100 speaker with you. This speaker has an optional solar panel. You don't have to be in the tropics to benefit from the charging power of the sun, because it only needs sunlight and not heat of the sun in order to charge up. You are not limited to using the speaker in daylight hours, either, because it has a rechargeable battery. So it can