The Moon Comet X Rear Light Is a super bright 50 Lumen seatpost mount rear light that will help to keep you seen on the roads at night. Featuring a high powered 3.7v 300 mAh rechargeable battery the light has a great run time in whatever mode you are using it in. Designed for the every day rider/commuter the light is water resistant, lightweight and and compact enough to fit in your pocket with ease. As well as keeping cars and other road users at bay, as the approach you from behind, the light also warns road users when cycling roundabouts and also when pulling out of tight cross junctions and or blind corners. Producing a 270 degree beam the light has one of the widest on the market, being seen from almost every angle. Programmed with 7 modes you are able to choose the one that best suits the weather conditions or remaining battery.