The Volt 400 uses the Opticube lens technology to maximise the best beam pattern utilising lens & reflector technology to emit a higher quality light & beam pattern in front of the rider, even with lower Lumen amounts. Behind you the rear light has true 180 degree visibility battery auto-save, automatically changing to flashing mode to allow more time to finish the ride as opposed to being left in the dark. Long Press To Turn On & Off to avoid accidentally turning off the lights when switching modes whilst riding Integral Heat Dissipation maximises the lumen power ensuring consistency of lumen outputt Front Light Features Double-click to high (headlights 400 Lm & above) to achieve maximum brightness instantly without cycling through modes; double-click to flashing (headlights up to 200 Lm) to quickly cycle between constant & flashing modes Rear Light Features • USB (Universal Serial Bus) Li-ion cartridge rechargeable battery • Lightweight – only 110g • Wide mounting strap with angle adjustment • Recharging time: 6 hrs This Light is great for: A powerful front & rear helmet light made to See & be seen. The features make it great for commuting rides as well as leisure riding. The lumens mean these lights are also great for unlit road riding/ rural commutes.