| Support | 39Use BT51 DongleYour BT51 dongle comes pre-paired to your headset or station out of the box. Plug it into your computer toconnect automatically. You can also pair the station and the BT51 dongle via Yealink USB Connect.LED Status What it meansFast flashing red and blue Pairing modeSolid blue Device connectedSlow flashing blue Reconnect a deviceSolid red Mute activeFast flashing purple A coming callSolid purple Microsoft Teams connected/on a callSlow flashing purple Microsoft Teams notificationOff No device connectRelated tasksYealink USB ConnectSupport• FAQ• Safety InstructionFAQView the FAQ guide on http://support.yealink.com/.Safety Instruction1. Do not disassemble the product by yourself or bring it near fire and water to avoid short circuit leakageor damage to the product.2. Do not use the product in high temperature, humidity, and corrosive environment to avoid damaging thecircuit and causing failure to charge or other failures.3. Do not expose the product to corrosive liquids. Otherwise, it will cause severe damage.4. Do not disassemble or re-equip the product for any reason to avoid secondary failure and burnout.5. Do not place the product in an environment below -10°C or above 60°C.6. Do not knock, throw or shake the product because rough methods will damage the internal circuit boardstructure. If your headset needs warranty service, the process is quick and easy. Please go to https://ticket.yealink.com/page/headset/warranty-service.html and submit RMA Claim to Yealink.