The Cairn XL is the most powerful in the Cairn family of lanterns and is equaly as versatile. It boasts an ultra-bright 350 Lumen LED lantern, up to four mobile device charges, up to 250 hours of light time, and bluetooth connectability. The free Cairn XL app allows you to control power, dimming, color, light alarms, proximity lighting, battery settings, and light strobe.