Brand: Mr. Heater Manufacturer's Part Number: F235100 Part Type: Portable Fans Product Line: Mr. Heater BaseCamp Tent Fans Summit Racing Part Number: MRH-F235100 UPC: 089301351004 Fan Diameter (in.): 8.00 in. Power Supply: Four D batteries Quantity: Sold individually. Mr. Heater BaseCamp Tent Fans Mr. Heater BaseCamp LED tent fans utilize state-of-the-art bulb technology and proprietary， advanced reflectors to pierce even the darkest nights. While total rated lumens are important， they deliver "effective light"... defined as the light you need to perform your task. While your eyes can't measure lumens， they sure can tell you if there is enough light to read in the dark or walk in the woods at night.Mr. Heater BaseCamp LED tent fans feature: * 2-speed fan with foam blades* Energy efficient CREE white LED rated to 50 lumens* Carabineer hook included* Operates with four D batteries (not included)* Up to 48 hours fan run time on low， up to 24 hours on high* 100+ hours light run time on low