This is a lantern that can be used for lighting during camping or disasters. It has three levels of brightness: HIGH/LOW/Flashing. It can be charged from a USB power source. It comes with a hook and magnet for mounting. LED Lantern Size (approx.): 7cm diameter x 4.9cm Weight (approx.): 130g 1800mAh I used it for camping, so there are some minor scratches. I think the capacity is less than 1800mAh. Four of these should be enough to light up a tent or tarp. It's palm-sized, so it's convenient to use as a flashlight. A charging cable is also included.