Using this pendant light is simple. First, have a licensed electrician install it for you according to the instructions in the box. Once installed, you can screw in an E27 bulb (up to 40W) that fits the 40mm maximum diameter requirement. You can adjust the length of the rods to your desired height. Since it's for indoor use only, don't place it outdoors. For maintenance, you can use a soft, dry cloth to clean the frosted glass and iron parts. If there are any issues within a year, you're covered by the replacement warranty.