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产品名称：high-fidelity bluetooth headphone b5
features:
innovative spt technology from sontia® england
bluetooth 4.0 with csr8670 chip, low power consumption and high stability
nfc pairing and memory-connect
enclosed memory foam ear-cushion for noise cancelling
line-in with audio cable
rf transmission auto off for power saving
specifications:
bluetooth version: v4.0
operating voltage: 3.7v(built-in li-polymer rechargeable battery)
distortion: 0.1%
frequency response: 20hz~20khz
s/n ratio: 80db
working range: 10 meters
working time: 10~12 hours
charge time: 3 hours