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产品名称：2.4ghz digital wireless headphone adh500
features:
comfortable ear-cushion
direct audio line-in
rf transmission auto off for power saving
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
working time: 12 hours
charge time: 7.5 hours
working range : 30 meters