Using the Cateye Lightset EL135 and Omni3 is simple. For the HL - EL135 front light, first insert two AA alkaline batteries into the battery compartment. Then, you can turn it on to start using the wide - beamed light for your commute. As for the Omni 3 rear light, put two AAA alkaline batteries in it and use the FlexTight bracket to attach it to your bike or the clothing clip to attach it to your clothes. When it comes to maintenance, make sure to check the batteries regularly. If the light starts to dim, it's time to replace the batteries. Also, keep the lights clean by wiping them gently with a soft cloth. Avoid exposing the lights to extreme temperatures or water for long periods as this may damage them.