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产品名称：senior wireless tv headphone e2
upc：6928078928948
features:
optical audio in for new generation tv
rf transmission auto off for power saving
microphone button for sound amplification
specifications:
transmission mode: gfsk
carrier frequency: 2.4ghz
operating voltage: transmitter 5v
headphone 3.7v
frequency response: 20hz~20 khz
distortion: 0.5%
signal-to-noise ratio: 80db
working time: 5 hours
working range: 30 meters