Using your Blackburn lights is a breeze. First, charge the lights using the included cable. It only takes about 3 hours to fully charge. Once charged, you can use the light as a front or rear light on your bike. To switch between the front and rear modes, check the light's settings. For the front light, you can choose between a high - brightness mode that lasts 1.5 hours or a flashing mode that lasts 5 hours. The rear light has the same runtime options. When it comes to maintenance, since the lights are waterproof to IP - 65 standard, you can clean them with a damp cloth. Just make sure to keep them away from extreme heat or cold. And don't forget, you can buy these lights individually or in a 2 - pack, so stock up for your needs.