So you’re happily riding out in the great wide open and you notice a storm approaching. It’s a beautiful scene… just you, an approaching storm, and a 500 lb lightning rod under your body. FEMA estimates that strikes kill 200 people and seriously injure 750 more per year — including the occasional rider. Protect yourself with this detector. It will let you know if a storm is approaching or departing, and will alert you of approaching strikes up to 40 miles away. A good thing on a grey wet day or long night ride. We have no clue how this thing works, but it really does. Small, dependable, accurate and effective. Comes with belt clip, and easy to use bar or fairing mount. Included batteries last up to 100 hours. 2"×2.75", 3 oz.