The AXA Nox City is an universal head light with a light output of 4 lux. The modern design is suitable for a variety of bikes, for instance city bikes. The integrated reflector and the double lens technology offer you extra security because you are better visible for oncoming as well as crossing traffic. The headlight is operated by an on / off switch and runs on 2 AA batteries that are included. The light has a long and competitive battery run time to make sure you can enjoy riding your bike without worrying about the battery level. For your safety a battery low indicator warns you when it is time to change your batteries. The batteries can be changed easily without a tool. LIGHT BEAM : 15 meters 'to see', 1000 meters 'to be seen'