For outdoor use. Enjoy flame effect and music in the rain or bathroom (IP65 rated). Bluetooth compatible with most of the smartphones and tablet devices up to 10 meters. Smart auto-connect to the last connected device when turned on. High quality speaker. USB built in battery, provides up to 8 hours in bluetooth speaker mode, 30 hours in flame flickering lighting mode, and 6 hours in flame flickering lighting with bluetooth speaker mode.