Using this Klein Tools 4 - in - 1 multi - bit electronic screwdriver is easy. First, choose the right bit for the screw you're working on. If you need to change the bit, just use the interchangeable shaft to quickly swap it out. When you're using the screwdriver, hold it by the Cushion - Grip handle for a comfortable and secure grip. The rotating cap helps you have better control, so use it to turn the screwdriver with precision. As for maintenance, keep it in a dry place to prevent the steel from rusting. Since the barrel is chrome - plated, it's corrosion - resistant, but still, avoid exposing it to too much moisture. Don't use it for jobs that are beyond its capacity, as it's designed for precision work on small equipment. If the bits get dirty, you can clean them with a soft cloth.