Which Frequency ?

Hi everyone,

I'm trying to replicate the RF communication to talk to the wristbands, and I'm wondering which frequency to use.


Here are the 3 systmes I found 

1. XyloShield configures the RF chip to operate at 869.5 MHz

github.com/StefanKrupop/XyloLibrary/blob/42481e66804ca7d13751fcf5a2cda522ce9fbd4e/radio_config.h#L24 


2.  The FCC test report of the MTX remote states that it operated at 909.2 MHz.

fccid.io/JY7-MTX/Test-Report/Test-report-3341135.pdf (Page 11)


3. The PC device that talks to Xylobands operated in 3 frecyency ranges: 909.2, 910.6 and 917.4 MHz.

fccid.io/JY7-RB4950/Test-Report/Test-report-1848101.pdf ( page 12)


Which one is correct ? 

Thanks !