Moon shield x auto rear lightthe moon shield x auto rear light is an eye catching light with features that help it stand out from the rest featuring a super bright cree xp e red led and with clever optics the light can be seen from a mile off the light is usb rechargeable which makes it convenient to use when riding to and from work programmed with 5 modes you are able to choose the one that you feel best suits the conditions you are riding in or in relation to how much battery is remaining f