CatEye Volt 50 USB Rechargeable Bicycle Tail Light - HL-EL460RC-Rear - 5342701 High-power 50 lumen rear LED light The lens protrudes slightly so traffic coming from the sides will see the light Innovative seat rail mount Helmet and seat post mounts available as optional extras Run Times: 8 hours on constant beam. 20 hours in any of the 3 flashing modes