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Product Parameter - Lenovo W870 User Manual

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W870 Bluetooth Headset User Manual
8. Some functions of the players are not available on the Bluetooth Headset
Reason: some operation instructions of the players and those of the Bluetooth are not
compatible, hence the failure of some functions of the players.
9. Slow or no response while pressing buttons.
This is due to the disorder of Bluetooth program caused by incorrect button operations.
Please plug in the charging cable to charge the headset and reset it. Disconnect the
charging cable and power on the headset for re-pairing. The device should work again.
10. Unable to mute the device
Limited by the Bluetooth agreement, if you want to mute the device, please adjust the
output terminal (PC or mobile phone) to achieve silent mode.
11. Delay of headset lamp indicator in pause state
After the headset is paused, delay may occur to some control instructions from the PC
after the headset sends the return instructions to the PC end. As a result, the headset
blue lamp cannot switch in time to flash every two seconds.
XI. proDuct parameter
Bluetooth Version: 2.1+EDR
Frequency response: 20Hz ~ 20kHz
Signal to noise ratio: -85dB
Battery capacity: 380mAh
Working voltage: 3.7V
Charging time: 2H
Maximum input power: 20mW
Transmitting range: 10M (Obstacles such as walls or other electronic devices may cause
interference or shorten working distance)
Modulation mode: GFSK, II/4 DQPSK, 8DPSK
Frequency range: 2400MHz ~ 2483.5MHz
Net weight of headset: 170g
Frequency Response: 100Hz ~ 10kHz
Sensitivity: -38±3dB @ 1kHz 0dB=1V/PA Signal to noise ratio: 55dB
CMIIT ID: 2012DP5291
― 12 ―
Drive unit: 2 x 40 mm
Sensitivity (SPL): 103±3dB/1mW @ 1kHz
Impedance: 32Ω±15% @ 1kHz
Working current: 25mA
Continuous working time: 12H
Input power: 10mW
Transmitting power:
Impedance: 2.2kΩ±10% @ 1kHz



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