Using the Bosch GLL3-330CG is easy. First, choose your power source - you can either use the included 12V Max Lithium - ion battery or four AA alkaline batteries. Once powered on, the smart pendulum system will self - level, but if you need to use it at a specific angle, you can switch to manual mode. You can control the laser from across the room using your smartphone and the free Bosch Leveling Remote App. With this app, you can turn the laser and receiver mode on and off, select the laser planes, and adjust line visibility. When using in bright light or for longer distances, switch to pulse mode and use the optional LR8 receiver. As for maintenance, keep it clean and dry. Avoid dropping it as the CAL Guard monitors for calibration issues. Also, store it in a cool place when not in use. If you're working in a rainy or dusty jobsite, the tough over - molded construction will protect it, but still try to keep it away from extreme conditions.