Eton Rugged Rukus Solar-powered, Bluetooth, smartphone-charging speaker, Green, NRKS200GR High efficiency mono crystalline Solar panel with internal Li-ion battery Charges your Smartphone on the go to keep your tunes streaming Internal battery provides 8+ hours for listening long into the night Stereo Sound - Pump Your Tunes with 2 Full Range Speaker Drivers IPX 4 rated - Rugged and Water Resistant for go anywhere audio! Great for any outdoor activity, or just lounging by the pool