Lenovo W770 - Manual (Page 10)

W770 Wireless Headset User Manual
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X. PRODUCT PARAMETER
Headset:
Drive unit ............................................................................................................... 2 x 40 mm
Frequency response ........................................................................................20Hz ~ 20KHz
Impedance ................................................................................................ 32Ω±15% @ 1kHz
Sensitivity (SPL) ...............................................................................103±3dB/1mW @ 1KHz
Signal to noise ratio ........................................................................................................65dB
Working voltage ...............................................................................................................3.7V
Working current .............................................................................................................58mA
Battery capacity .........................................................................................................380mAh
Continuous working time ................................................................................................... 6H
Charging time ................................................................................................................. 2.5H
Input power ...................................................................................................................20mW
Maximum input power ..................................................................................................45mW
Net weight of headset .....................................................................................................160g
Net weight of USB Dongle ..................................................................................................6g
Microphone:
Frequency response ...................................................................................... 100Hz ~ 10kHz
Impedance ..............................................................................................2.2kΩ±10% @ 1kHz
Sensitivity ................................................................................ -38±2dB @ 1kHz 0dB=1V/PA
Signal to noise ratio ........................................................................................................55dB
USB Dongle specification:
Working voltage ..................................................................................................................5V
Working current .............................................................................................................55mA
Transmitting power ...................................................................................................... <+6dBM
Transmitting range ...........................................................................................................10M
Modulation mode .......................................................................................................... GFSK
Frequency range ................................................................................. 2404MHz ~ 2476MHz
Interface...........................................................................................................................USB