iNami Solar Rechargeable Bluetooth Speaker w/ 2 3-Watts Speakers & Hands Free Microphone Up to 33 feet bluetooth connection Multiple charging options, including solar power, USB charging, cigarette lighter, and outlet charging Touch panel for track, volume, play, pause, answer control Rich full stereo sound with two 3 Watts speakers On Bluetooth - 4 to 10 hours playtime; on analogue - 5 to 15 hours playtime