Housed in a 1200 series Pelican case, the TBO-F ('F' is for 'Fieldcase') is well-suited for outdoor use in the roughest field conditions. Built for extended range, the TBO-F is powered by a long lasting 12 volt internal gel-cell battery which can be charged by a wall transformer or run externally by a larger battery through the same jack.TBO-F SpecificationsSee also: Model TBO-DL6F with Data LoggingPress Release: Point Four Merger with Common Sensing