Using this impact driver is straightforward. First, make sure you've inserted a compatible Makita 18V LXT® battery with the Star symbol. You can use the one-touch 4-speed power selector button under the chuck to change speeds with one hand. For different applications, select the appropriate speed to get the best balance of speed and torque. When tightening screws, you can use the Tightening Mode (T-mode) to prevent damage to the screw or workpiece. The reverse rotation auto - stop mode will stop the rotation and impact when the fastener is loosened enough, so you don't have to worry about over - loosening. Always remember to use genuine Makita batteries and chargers to keep the tool running smoothly. After use, clean the tool regularly to remove dust and debris. Keep it in a dry place. Since it has Extreme Protection Technology (XPT™), it can handle some tough job - site conditions, but try to avoid extreme dust and water exposure if possible. The tool, battery, and charger come with a 3 - year limited warranty, so if you have any problems during this period, contact Makita for support.