Cateye volt 400 duplex helmet lightstay visible when riding after dark, thanks to the duplex helmet light from cateye'. '.strtoupper('b')enefiting from a powerful output of 400 lumens to help light up the route ahead and keep you visible to other road and trail users'. '.strtoupper('w')hat's more, as it's a helmet light, you can direct the beam exactly where you want it to go, instead of having to turn your handlebars'. '.strtoupper('f')ront and rear visibilityit also features a bright 50 lumens rear light at the back of the unit, to make you more visible to upcoming traffic'. '.strtoupper('u')sb rechargeable, and packed with a range of settings, the duplex light will help you to keep up that commute to work through the darker months!featuresbattery usb li ion cartridge rechargeable batteryattachment wide mounting strap with angle adjustment'. '.strtoupper('h')elmet mount included.recharging time 6 hourslumens 50 400 lumensmodes outputs runtimeshigh 400 lumens, 3 hoursmid 100 lumens, 10 hourslow 50 lumens, 18 hourshyper constant 400 lumens, 9 hoursflashing 50 lumens, 150 hoursrear output 10 lumensruntime modesconstant 25 hoursflashing 250 hoursdimensions 127 x 42.5 x 31 mmweight 110gbuy cateye accessories from chain reaction cycles, the world's largest online bike store.