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产品名称：bluetooth headphone b9
features:
memory-connect
multi-function remote control with microphone
durable metal headband
3.5mm direct line-in
22 hours listening duration
memory-connect
multi-function remote control with microphone
durable metal headband
3.5mm direct line-in
22 hours listening duration
specifications:
bluetooth version: v4.2
frequency range: 20hz~20khz
distortion: 0.5%
s/n ratio: 80db
sensitivity: 90±3db
impedance: 32ω
battery: 3.7v/500ma
driver unit: φ40mm
charge time: 3 hours
working time: 22 hours
working range: 10 meters