Dear sir,
Greetings for the day .
As I read the problem, you want to know the health hazards about bluetooth smart bands.
Till date we have not recieved any complaints or side effects from using bluetooth devices like a smart band etc.So you can use it.
All the best.
Thanks and regards
Dr Rachna Sethi
Health Tips
avoid wearing it 24x7 and be sure the quality of material of the band is good ,so that it doesn't cause any contact allergy on your skin.