You can change them using the button on the top of the device. The weight of the device is 110g which, makes it perfectly suitable for cycling as it will never be on the way. Moreover, the device features IP86 waterproof design which will allow you to conquer any weather. Literally. The front light is 360 degree rotatable, thus, it can illuminate anything. Finally, if the power suddenly goes off, you can always recharge it with a micro USB. It’s important to get just the correct quantity of light in which you require that, as opposed to blindly throw light in all directions. It is very important that you have lights on when you ride in low light conditions or at night.