Luci Solar String Lights Deliver 40 Hours Of Light Across A 44 Ft Cord. Featuring A Powerful Battery With Mobile Charging Capabilities, The Unit Is Completely Detachable From The String, Allowing You To Charge The Unit While Leaving The String Setup Intact. Want To Take The Lights With You? Simply Flow The String Back Into The Expandable Unit And Take It On Your Next Adventure. String Up Some Sun With Luci.