Pb 28 LED power array provides steady, courtesy & Super flash modes Sleek linear design integrates smoothly to a cyclist's seat post, seat stay, rear rack, helmet and even cascadia ALX rear fenders Run times: 2 hrs (steady), 3.5 hrs (courtesy) and 11.5 hrs (Super flash) The 370 mah Micro USB rechargeable lipoly battery charges in 2 hours Tested to FL1 standards and dust & water resistance rated to IP64 standard Color Red Brand Planet Bike Power Source Rechargeable Battery Powered Water Resistance Level Water Resistant Item Weight 1.12 Ounces Mounting Type Seat, fender, helmet Mount Auto Part Position Rear International Protection Rating IP64 Item Package Dimensions L x W x H 5.6 x 3.6 x 2.2 inches Package Weight 0.14 Kilograms Brand Name Planet Bike Suggested Users all bike riders ages 4-94 Manufacturer Planet Bike Part Number 3087 Included Components Shiner Back Bike Tail light. With mounting strap for Shiner helmet or rack mount. With USB charging cable This planet bike tail light is beautifully made. It isn't too slim. It is angled like a work of art. It's mounting has a well shaped rubber buffer, so no matter how hard you ride, it's not likely to suddenly snap off. The hooks are solid, and even though 2 rubber straps attach it to the bike, there's a mounting bracket specifically for racks, and the rounded shape mimics a post rail, so the rubber buffer sits snuggly, and securely. I hear no rattling like with other strap on lights, and I have no concerns of it breaking, or falling off. There's 3 modes, steady (bright), "superflash" (basically strobe light), and "courtesy" (which is your efficiency mode). Courtesy turns on 2 red lights at the ends continuously, and the bar in between turns on and off like a warning light. It saves energy, while still getting peoples attention, without giving them a seizure.