DESIGN & DETAILS: LED Lanterns utilize state of the art bulb technology and proprietary, advanced reflectors to pierce even the darkest nights While total rated lumens are important, BaseCamp lanterns deliver "effective light"...defined as the light you need to perform your task BaseCamp Lanterns deliver the light you need, with reflectors to put the light right where you need it, while utilizing less battery power than other lanterns on the market today Two speed fan with foam blades Enegry efficient CREE white LED rated to 50 lumens Carabineer hook included Operates with 4 x D batteries (not included)