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产品名称：2.4ghz wireless induction neckloop headphone e1
ean:6928078927422
features:
neckloop anti-drop design
optical audio in for new generation tv
neckloop induction to hearing aid device
adjustment of sound balance and treble/tone clarity
microphone button for sound amplification
specifications:
carrier frequency: 2.4ghz
operating voltage: transmitter 5v
receiver 3.7 v lithium polymer battery
frequency response : 20hz–20 khz
distortion: 0.5%
signal-to-noise ratio: 85db
work time: 6 hours
charge time: 3 hours
range: up to 30 meters