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产品名称：2.4ghz optical wireless headphone adh300j
features:
breathable knit earmuffs
30 meters transmission distance
human engineering design for adjustable wearing
optical connection
specifications:
carrier frequency : 2.4ghz digital
operation voltage : transmitter ac/dc 5v power adaptor
headphone 2 x1.2v aaa size rechargeable nimh batteries(included)
frequency response: 20hz – 20khz
distortion: 0.5%
s/n ratio: 80db
operation time: 15~20 hours
charge time: 7.5 hours
operation distance: 30 meters