binaural beat frequency

Which headphones should I expect?
RPWF930 Panasonic FM wireless Headphones with Surround Sound RF transmission up to £ 69.99 100 meters, 40mm large-caliber control units. closed for powerful sound, surround sound control, automatic control system, practice Stand Rechargeable, economic power auto on / off transmitter, power adapter and rechargeable batteries supplied. free adaptation headband for comfort, control volume on the headphones, frequency response 18Hz-22kHz. OR Sony MDR-RF860 FM Wireless Headphones £ 79.99 permanent dock with the department easy. 40mm driver. Until 100 meters of transmission coverage. Auto tuning. Volume control on headband. Mute function. Switching on / off the transmitter. adapter. Runs with 2 x NiMH rechargeable batteries (supplied). adjustable headband. ———————————– I can not choose. I need to be very good because I use I-Doser uses binaural beats and frequencies of 20-22Hz.
Sony MDR-RF860 get FM Wireless Headphones £ 79.99 I think it's good
Air ( Alpha Binaural Beats )
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