Using these exterior LED wall lights is quite simple. First, find a suitable outdoor location for mounting. Remember, they must be installed by a licenced electrician, and you'll find an installation instructions sheet in the product box to guide you through. Once installed, these lights are ready to provide reliable illumination. They're suitable for 2 - way switching, so you can control them easily from different places. You can also pair them with PIR or Microwave sensors for added convenience. Keep in mind that these lights are not suitable for dimming. As for the ambient temperature, they can work well from -20 to 50°C. To avoid any warranty problems, ensure that the IP65 rating is appropriate for your intended use. For maintenance, you can gently clean the surface of the lights with a soft, dry cloth from time to time. This will help keep them looking good and functioning properly.