Regulatory Notices101Regulatory NoticesImportant Safety InformationTo reduce risk of fire, severe personal injury and damage to property, read the following safetyinformation carefully before using the product.Environmental Requirements Place the product on a stable, level and non-slip surface. Do not place the product close to heat sources, in direct sunlight or next to anyhousehold appliance with strong magnetic field or electromagnetic field, such as amicrowave oven or a refrigerator. Do not allow the product to come into contact with water, dust and chemicals. Protect the product from aggressive liquids and vapors. Do not place the product on or near any inflammable or fire-vulnerable object, suchas rubber-made materials. Do not install the product in rooms with high humidity, for example, in bathrooms,laundry rooms and wet basements.Safety Notes During Operation Use only spare parts and accessories supplied or authorized by Yealink. Theoperation of non- authorized parts cannot be guaranteed. Do not place heavy objects on top of the handset or the base station in case ofdamage and deformation caused by the heavy load. Do not open the handset or the base station by yourself for repair purpose, whichcould expose you to high votages. Have all repairs carried out by authorized servicepersonel. Do not let a child operate the product without guidance. Keep the small accessories contained in your product out of reach of small childrenin case of accidental swallowing. Before plugging or unplugging any cable, make sure that your hands are completelydry. Do not hold the handset up to your ear when speakphone is on or when the ringeris ringing as the volumn can be very loud, which may be harmful to your hearing. During a thunderstorm, stop using the product and disconnect it from the powersupply to avoid lightning strike. If the product is left unused for a rather long time, disconnect the base station fromthe power supply and unplug the power adapter. When there is smoke emitted from the product, or some abnormal noise or smell,disconnect the product from the power supply, and unplug the power adapterimmediately. Remove the electrical cord from an outlet by pulling gently on the power adapter,not by pulling the cord.