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产品名称：bluetooth headphone b16
specifications:
bluetooth version: v4.1
chip: csr8635
frequency range: 20hz~20khz
distortion: 0.5%
s/n ratio: 80db
sensitivity: 96±3db
impedance: 32ω
driver unit: 40mm
charge time: 2.5 hours
working time: 20 hours
working range: 10 meters