Compact size and shape to fit where space is limited. Lens sonically sealed to base providing a \"Bell-Jar\", making this lamp fully submersible with easily replaceable bulbs. Meets all applicable DOT-108 lighting requirements for trailers 80\" wide or wider when properly mounted. Pre-wired with molded plugs for easy installation. 6\" x 3-1/2\" x 2-1/4\".