Before plugging or unplugging any cable, make sure that your hands are completely dry.
Do not spill liquid of any kind on the product or use the equipment near water, for example, near a bathtub,
washbowl, kitchen sink, wet basement or near a swimming pool.
During a thunderstorm, stop using the device and disconnect it from the power supply. Unplug the power plug
and the Asymmetric Digital Subscriber Line (ADSL) twisted pair (the radio frequency cable) to avoid lightning
strike.
If the device is left unused for a rather long time, disconnect it from the power supply and unplug the power
plug.
When there is smoke emitted from the device, or some abnormal noise or smell, disconnect the device from the
power 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 part of the product or auxiliary product.
Before connecting a cable, connect the grounding cable of the device first. Do not disconnect the grounding
cable until you disconnect all other cables.
Battery Requirements
Do not immerse the battery into water, which could short-circuit and damage the battery.
Do not expose the battery to an open flame or leave the battery where it could be subjected to extremely high
temperatures, which could cause the battery to explode.
Do power the handset off before removing the battery.
Do not try to use the battery for the power supply of any device other than this handset.
Do not open or mutilate the battery, released electrolyte is corrosive and may cause damage to your eyes or
skin.
Use only the rechargeable battery pack delivered with the handset or those rechargeable battery packs
expressly recommended by Yealink.
Defective or exhausted battery should never be disposed of as municipal waste. Return old battery to the
battery supplier, a licensed battery dealer or a designated collection facility.
Cleaning Requirements
Before cleaning the device, disconnect it from the power supply.
Use a piece of soft, dry and anti-static cloth to clean the device.
Keep the power plug clean and dry.
Troubleshooting
The unit cannot supply power to Yealink device.
There is a bad connection with the plug.
1. Clean the plug with a dry cloth.
2. Connect it to another wall outlet.
The usage environment is out of operating temperature range.
1. Use in the operating temperature range.
The cable between the unit and the Yealink device is connected incorrectly.
1. Connect the cable correctly.
You cannot connect the cable properly.
1. You may have connected a wrong Yealink device.
2. Use the correct power supply.
Some dust, etc., may be in the port.
1. Clean the port.
Contact your dealer or authorized service facility for any further questions.
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