The cateye volt 400 front usb rechargeable light will light the path or road ahead of you illuminating any avoidable obstacles simply double click to turn the light on and press once to change between different light modes you have the choice between flashing hyper constant high medium or low depending on the flash mode you are using the battery can last for 3 hours 400 lumens up to 60 hours 50 lumens once the light has completely run out of battery you should leave it on charge for 6