The Eton Rukus Xtreme Bluetooth speaker features a solar panel generating enough energy for the entire day. In addition, the internal rechargeable battery provides power for another 12 hours. Its robust housing consists of shock- and splash-proof plastic and rubber, making the speaker particularly suitable for outdoor use. The handle at the narrower end of the speaker serves as carrying aid or as an attachment for a backpack or tent. When the speaker is connected to a smartphone via USB, it charges the device with its internal rechargeable battery.