When using your telephone equipment, the following basic safety precautions should always be followed to reduce the risk of fire, electric shock and injury to persons: 1. Read, understand and follow all warnings and instructions 2. Unplug the product from the wall outlet before cleaning. Do not use liquid cleaners or aerosol cleaners. Use a soft damp cloth for cleaning. 3. Do not place this product on unstable surfaces. The product may drop, causing serious damage to the product. 4. Do not overload wall outlets and extension cords as this can result in fire or electric shock. 5. Never push foreign objects of any kind into this product through cabinet slots as they may affect dangerous voltage points or short circuit parts that could result in fire or electric shock. Never spill liquid of any kind on the product. 6. Avoid moving or disconnecting this unit during a heavy storm, as there may be a remote risk of electric shock from lightning and thunder. 7. Unprofessional person must not disassemble the telephone even meet troubles, please contact with service center.