Using the Milwaukee 2719 - 21 M18 FUEL Hackzall is easy. First, make sure the M18 REDLITHIUM XC5.0 Battery Pack is fully charged and inserted into the tool. Hold the saw with one hand for great control, especially when making cuts in tight spaces. You can start cutting materials like metal quickly because of its low - vibration design. When using it, always wear safety goggles to protect your eyes from debris. After each use, wipe down the saw with a clean cloth to remove any dust or debris. The rubber seal and weep holes protect it from water, but try to avoid using it in extremely wet conditions. To keep the saw in top shape, charge the battery regularly and don't let it over - discharge. Also, check the saw's parts periodically for any signs of wear and tear. With proper use and maintenance, this saw will serve you well for a long time.