When not in use, unplug the vacuum cleaner from the wall outlet. This protects the cord and plug and helps prevent accidents. Most commercial vacuum cleaners are not intended for outdoor use. Store and use them only indoors. Never vacuum a wet surface. This can damage the motor(s) and puts the user at risk for electrical shock. If a machine has been exposed to moisture, have it checked by a certified technician before use. Never drop a vacuum cleaner. If a machine is accidentally dropped, have it checked by a certified technician before using it again.Never pull a vacuum cleaner by its cord, and keep the cord away from sharp edges or corners. Keep fingers away from all powered moving vacuum cleaner parts. Keep vacuum cleaners away from children. Do not clean up toxic or flammable materials with a vacuum cleaner; if you are unsure about what a substance is or if it looks unusual, investigate carefully before vacuuming the area. Do not pick up hard or sharp objects, including glass, nails, screws, coins, etc., with the machine.