Both will work using different methods. Modulated infra-red laser light mode versus Tens Contact mode. If you already have a frequency generator XM/GX then I would go with Wrist Laser method. If you want a wearable portable solution then HeaWea/Microgen is an option.
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https://www.spooky2.com/forums/viewtopic.phpf=157&t=14580&sid=07c9b7beba85a20a6b0df908c0dad96c
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