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产品名称：active noise cancellation bluetooth headphone bn1
eliminate unwanted noise for 20db
foldable design
38 hours playtime
foldable design
38 hours playtime
specifications
bluetooth version: v5.0
chipset: bes2300
driver unit: 40mm
frequency response: 20hz~20khz
anc effect: 20db
working time: 38 hours
charge time: 4 hours
working range: 10 meters