[. . . ] Stay alert, watch what you are doing and use common sense when operating a power tool. Do not use a power tool while you are tired or under the influence of drugs, alcohol or medication. A moment of inattention while operating power tools may result in serious personal injury. [. . . ] Make sure the latches on each side of the battery pack snap into place and the battery pack is secured in the drill before beginning operation. Locate the latches on the side of the battery pack and depress them to release the battery pack from the sander. Therefore, switch should always be locked when not in use orcarrying at your side. Selecting the correct size grit and type sandpaper is an extremely important step in achieving a high quality sanded finish. Aluminum oxide, silicon carbide, and other synthetic abrasives are best for power sanding. Natural abrasives, such as flint and garnet, are too soft for economical use in power sanding. in general , coarse grit will remove the most material and finer grit will produce the best finish in all sanding operations. The condition of the surface to be sanded will determine which grit will do the job. If the surface is rough, start with a coarse grit and sand until the surface is uniform. Medium grit may then be used to remove scratches left by the coarser grit and finer grit used for finishing of the surface. To turn OFF the sander: push the ON (I) / OFF (O) switch to the right. WARNING Unsecured workpieces could be thrown towards the operator, causing injury. CAUTION To avoid damaging the motor from overheating, be careful not to let your hand cover the air vents. Failure to do so could cause accidental starting, leading to serious personal injury. Carefully press the fuzzy side of the sanding sheet against the pad as tightly as possible. Note: Sanding sheets can be reused for the life of the sanding abrasive. It is recommended that you keep the sanding sheet backing pad clean to provide for best adhesion. Hold the sander in front and away from you, keeping it clear of the workpiece. [. . . ] WARNING Always wear safety goggles or safety glasses with side shields during power tool operation or when blowing dust. Therefore, it is important that they be cleaned periodically to remove sanding residue and foreign material that can accumulate over time. WARNING Always remove the scrubbing pad or sanding sheet from the sander before cleaning. [. . . ]