Minimal and mighty! The USB rechargeable Asteroid tail light from Portland Design Works mounts in seconds and shines super brightly with high quality optics so you can be seen. The double-click lens prevents accidental ons and offs. Ride up to 35 hours before needing a charge. Pairs nicely with the Asteroid Headlight - also available as a light set. - 3 Modes (burn time): Flash (35 hrs), Pulse (6.5 hrs), Steady (4.5 hrs) - Weatherproof exterior for all season riding - Micro USB recharging cord included - Weight: 76 g (2.7 oz)