PWR Trail is a modular bike light. But it's not JUST another bike light. Not only is it a high powered bike light, but simply take the product apart and you have much more. A lighthead and a PWR Bank to charge devices that is also the battery for all products in the PWR range.   BATTERY INDICATOR - Hate it when you run out of battery with no warning? That'll never happen with PWR Trail, with 4 built in battery indicator lights. Tap the bottom of the light to activate the battery indicator. 4 lights = fully charged, 2 lights = half charged etc. EASY TO MOUNT & USE - This light can be mounted on top or below your handlebars, directly under your Garmin, or on your helmet. It comes with a side mount and shim that fits handlebars 22.2-38.1mm diameter. Once mounted, using PWR Trail is a breeze. It's a simple twist-head operation to turn light on & off and to scroll through light modes. CHARGE YOUR DEVICES - Press the red button to release the lighthead, and use the PWR bank to charge your phone, GoPro, cycle computer or other device. 1 hour riding @1000 lumens means you can top up charge your iPhone by 75%. Charge your PWR Trail using the included micro USB cable, charge time is 3.5 hours. WIDE BEAM & CUSTOMISABLE MODES - PWR Trail outputs a max 1100 lumens, and can run for up to 300 hours on Eco Flash Mode. Its elliptical beam gives broader, bright road coverage. It comes with 6 pre-programmed modes, and you can program the light to suit your needs with Modemaker. You can control brightness, adjust runtimes and add new light modes.   RUNTIME table, th, td { padding: 5px; border-collapse:collapse } table { border-spacing: 2px; } tr { border-bottom: 1pt solid black; } MODE LUMENS RUNTIME Max 1100 1.7hrs Mid 600 2.5hrs Stamina 90 18hrs Pulse 330 7hrs Strobe Flash 250 12hrs Eco-Flash 17 250hrs   SPECIFICATION Dimensions - H: 128mm x W: 35mm x L:35mm. Weight - 230 grams. Lumens - 1100.   INSTRUCTIONS Connect lighthead to PWR bank: Insert the two lighthead plug pins into the battery. When connected, your lightheads LED's will flash. Connect lighthead to sidemount: Slide the mount into the slot on the side of the battery. Then tighten the thumbwheel. To remove the mount you will need to loosen the thumbwheel. Operation: Once the lighthead and battery are connected, twist the lighthead and hold to turn on, twist and release to change modes.