Another wonderful eco-friendly gadget from Devotec here called the Solar Sound Bluetooth Speaker. As the name suggests, this techie speaker is powered by the solar panels that are attached on top of this stylish speaker. This wonderful speaker is lightweight, portable, and yet was still able to provide crisp sound. The solar sound speaker can run up to 8 hours on medium volume and 4 hours on maximum volume. It also has an integrated Bluetooth and for an easy wireless connection to your multimedia players. The solar panels collect the sunrays on a sunny day and powers the speaker allowing its users to enjoy good music even at night. The touch screen display made playing your music easier with the solar sound Bluetooth speaker.