Moon arcturus auto rear lighta user friendly, super convenient rear light that is ideal for staying visible in built up urban areas.side lightingmoons arcturus auto comes with a specially adapted beam that spreads the light and provides excellent levels of side visibility. This helps you stay seen from various different angles which is important when cycling through built up urban areas where youll often be dealing with multiple lanes of motorists.mountingthe rear light comes with all the mounting parts you need to securely attach the light to pretty much anything and anywhere. The universal brackets can easily attach the light, without the need of tools or additional parts, to your seat post, backpack, helmet, etc.usb rechargeableto save you the constant hassle of having to swap in and out batteries the light is usb rechargeable. Coming with a charging cable that allows you to recharge the light via any standard usb port which can easily be found universal. The light takes just two hours to fully recharge time and comes with up to 17 hours of battery life.light modesthe light comes with seven different light modes which allows you to find the best possible mode for your current lighting environment and battery life. The light modes included aremode one 10 lumens light output ndash 3.45 hours battery lifemode two 15 lumens light output ndash 2.20 hours battery lifemode three 35 lumens light output ndash 1.20 hours battery lifemode four flashing 10 lumens light output ndash 17 hours battery lifemode five flashing 35 lumens light output ndash 5 hours battery lifemode six flashing 35 lumens light output ndash 8 hours battery lifemode seven flashing 70 lumens light output ndash 16.30 hours battery lifein the boxarcturus auto rear lightuniversal bracket2 x o rings 20 35mm and 35 52mmbelt clipusb charging cablefeatures70 lumens maximum light outputside visibility beamwater resistant to ipx4 certificationbattery life indicator7 different light modesusb rechargeable2 hours full recharge timecomes with tool free mounting optionsautomatic, light sensitive on offcnc aluminium heat sinking casingweighs 30gdimensions 57.5 x 28.5 x 19mmbuy moon lights from chain reaction cycles, the world's largest online bike store.