The Exposure Revo Dynamo pack is an all new concept for Exposure Lights; for the first time Exposure Lights is doing away with batteries and embracing the latest in dynamo developments and features the new super-efficient dynamo hubs which enable the Revo to be used both on and off road. This compact Dynamo powered Exposure light offers 800 lumens out put with the burn time only limited by the rider’s endurance and if you keep pedalling the light keeps shining bright. The light uses Stand Light Technology which means when you stop riding the light dims slightly but remains lit for 10 minutes and it ensures you will still be seen when stopped at junctions. The Exposure Revo Dynamo bounces straight back to full output after a couple of pedal revolutions and there is up to an hour of light produced after this to help with all post ride activities ... More info