Moon crescent rear light the moon crescent rear light is the ideal commuting companion quick releasing straps make it easy to detach and a battery indicator makes sure youre not caught short on the way home the versatile usb charging facility means in office replenishment is always an option features 1 piece cob 15 chips high brightness red led 25 lumens of output rechargeable lithium polymer battery3 7v 300mah usb rechargeable 5 modes standardhighover drive50 flashing 100 flashing