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产品名称：2.4ghz digital senior wireless headphone aph100
upc: 6928078925299
features:
adjustment of sound balance
one transmitter can be connected to several headphones
selectable adjustment of tone clarity
two rechargeable batteries
microphone button for sound amplification
specifications:
operating voltage: transmitter 5v
headphone 3.7v 350mah
carrier frequency: 2.4ghz
operation distance: 30 meters
frequency response: 20hz-20khz
distortion: ＜0.5%
s/n ratio: >75db
working time: 8 hours
charge time: 4 hours