Pro 4200 MX Enduro Helmet Mounted Light with Jawbone Mount. Ideal for off-road applications, the Pro 4200 MX Enduro Helmet Headlamp is equipped with 6 high quality LEDs and comes with Jawbone MX Mount for Pro Series. NiteRider's Patented mount attaches securely to full face helmets allowing you to see that trench, maintain your corner speed, rip through that corner, and flow through your line! Increase your visibility and enhance your riding experience by seeing farther and wider, delivering light to areas that your headlights don't. Specifications by FL1 Standards: Lumen Output: 4200. Run Time: 1:30 - 21:00 hrs. Charge Time: 3:00 / 6:00 hrs. Battery: 8-cell Li-Ion Battery with USB output capability. Weight: Head light and Jawbone MX Mount = 344 grams. 8 Cell Battery = 593 grams. Run Times: Low - 6:00h at 1000 Lumens.