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Environmental Condition:
Item  Specications
Temperature  Operational 0 ~ 40°C
Storage -20 ~ 60°C 
Humidity  Operational 20 ~ 80% RH (No condensation)
Storage 5 ~ 95% RH (No condensation)
Altitude Operational 0 ~ 3,000 m
Internal Speaker:
Item  Specications
Output  10W+10W(RMS) 
Impedance  8Ω
Output Sound Pressure  82 dB/W/M 
Frequency Response  160 Hz ~ 13 KHz