To use this night light soldering kit, first, gather all the components in the kit and the basic soldering materials you need, like a soldering iron, solder, and a micro USB cable. Then, start assembling the parts according to the general soldering process. Take your time, especially when putting the housing around the LED PCB. Make sure all connections are secure. When using the night light, just plug it in with the micro USB cable. It will adjust its brightness based on how dark it is around. As for maintenance, keep it in a dry place. If you notice any loose connections, you can resolder them. Remember, this is a kit that requires assembly, so basic soldering knowledge is a must. And it doesn't come pre - assembled, so be patient during the assembly process.