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User Manual D312U is a lightweight telephone headset with retractable headband. It’s compatible with all kinds of mobile devices and computers, supports the functions of playing music and HD web phone calls. 1. Design...
1) Retractable headband 2) Microphone 3) 3.5mm AUX Connector 4) USB Connector 5) Volume Control 6) Volume “+ ” 7) Volume “- ” 8) Mute 9) Microphone Mute 2. Button Function Note: The led indicator is red only when microphone is mute.
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Icon Name Function While playing music, short press to Mute pause or continue to play. Short press “+” to volume up; Long press Volume “+” “+” to make it up to maximum volume. Short press “-” to volume down; Long press Volume “-”...
5. Specification 1) Nominal Impedance (AC): 32Ω±15% 2) Rated working power: 10mW 3) Effective frequency range: 20Hz-20KHz 4) Microphone sensitivity: -42±3dB 5) Headset sensitivity: 115±3dB 6) Sound distortion: ≤3% 6. Common Problems Q1: No sound in headset. Solution: Ensure the connection is correct; ensure USB port of your computer is in good condition;...
plugs into the jack perfectly; ensure the mute function is off. Q2: A sharp voice in speaker or microphone. Solution: The volume maybe too loud or the microphone is too close to your mouth. Please adjust your speaker to a suitable volume and the microphone in a proper distance.
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damage, short circuit and warranty failure. 2) Disassembling your earphone may damage the earphone and would be beyond our service warranty. 3) Do not use your earphone in a dusty environment. 4) Please use a clean, soft and dry cloth to clean your earphone. 5) Keep placing the earphone in its original package when not using 6) Do not let your children play with the earphone.
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