9Quick start guideVolume adjustment• Tap or on the IP phone during a call to adjust thereceiver volume• Tap or on the IP phone when the phone is idle orringing to adjust the ringer volume• Tap or to adjust the media volume in thecorresponding screenRegulatory noticesOperating ambient temperatures• Operating temperature: +32° to 104° F (0° to 40° C)• Relative humidity: 5% to 90%, noncondensing• Storage temperature: -22° to +160° F (-30° to +70° C)WarrantyOur product warranty is limited only to the unit itself, whenused normally in accordance with the operating instructionsand the system environment.Explanation of the symbolsDC symbolis the DC voltage symbol.WEEE Warning symbolTo avoid the potential effects on the environment andhuman health as a result of the presence of hazardoussubstances in electrical and electronic equipment, end usersof electrical and electronic equipment should understandthe meaning of the crossed-out wheeled bin symbol. Donot dispose of waste electrical and electronic equipment(WEEE) as unsorted municipal waste and collect suchWEEE separately.Restriction of Hazardous Substances Directive (RoHS)This device complies with the requirements of the EU RoHSDirective. Statements of compliance can be obtained bycontacting support@yealink.com.Safety instructionsSave these instructions. Read these safety instructionsbefore use!General requirements• Before you install and use the device, read the safetyinstructions carefully and observe the situationduring operation• During the process of storage, transportation and operation,please always keep the device dry and clean, and avoidcollision• Please do not attempt to dismantle the device by yourself. Incase of any discrepancy, please contact the appointedmaintenance center for repair• Please refer to the relevant laws and statutes while using thedevice. Legal rights of others should be respected as wellEnvironmental requirements• Place the device in a well-ventilated place. Do not expose thedevice to direct sunlight• Keep the device dry and free of dust• Do not place the device on or near any inflammable orfire-vulnerable object, such as rubber materials• Keep the device away from any heat source or open flame,such as a candle or an electric heaterOperating requirements• Do not let a child operate the device without guidance• Do not let a child play with the device or any accessory toavoid accidental swallowing• Please use the accessories provided or authorized by themanufacturer only• The power supply of the device shall meet the requirementsof the input voltage of the device. Please use the providedsurge-protection power socket only• Before plugging or unplugging any cable, make sure thatyour hands are completely dry• Do not spill liquid of any kind on the product or use theequipment near water, for example, near a bathtub,washbowl, kitchen sink, wet basement or swimming pool• During a thunderstorm, stop using the device and disconnectit from the power supply• If the device is left unused for a long time, disconnect it fromthe power supply and unplug the power plug• When there is smoke emitting from the device, or anabnormal noise or smell, disconnect the device from thepower supply, and unplug the power plug immediately• Contact the specified maintenance center for repair• Do not insert any object into equipment slots that is not partof the product or auxiliary product• Before connecting a cable, connect the grounding cable ofthe device first. Do not disconnect the grounding cable untilyou disconnect all other cablesCleaning requirements• Before cleaning the device, disconnect it from thepower supply• Use a piece of soft, dry and anti-static cloth to cleanthe device• Keep the power plug clean and dry