Though even if you consider any possible harmfull effects like thyroid nodules formation correlation [1] (people somehow only think about ionizing radiation, but there much more that happens in a cell that can be possibly disrupted without xray level stuff to damage dna or heat: there are ion channels and what have you), the Bluetooth on gshock — if set up — will work only for a few seconds twice a day. Basically nothing even if you sleep directly on it all night long
You absolutely can skip setting this up
Though even if you consider any possible harmfull effects like thyroid nodules formation correlation [1] (people somehow only think about ionizing radiation, but there much more that happens in a cell that can be possibly disrupted without xray level stuff to damage dna or heat: there are ion channels and what have you), the Bluetooth on gshock — if set up — will work only for a few seconds twice a day. Basically nothing even if you sleep directly on it all night long
[1] https://www.nature.com/articles/s41598-024-63653-0
I'm fairly certain they were concerned about privacy, not... any of that. Bluetooth is promiscuous in an already noisy band.