Specifications LazerBrite full unit total length 8.25"- 8.5" Note, the length changes depending on the orientation of the LED heads-i.e., if the heads are pointing in or out, and whether the heads are turned on or off do to the fact that as the rotational switch is activated the top and bottom of the LED head are screwed together, Tube ID .75" Tube OD 1" at threads Width of LED head 1.25" at bulb side to 1.56" across lanyard ears. Weight LED Heads 1 oz. each Tube 1 oz. LazerBrite full unit: 3 oz. total weight