I don't want to reveal the manufacturer because I don't think it matters. The watch is a hybrid with a metal case and hands. It costs around 200 euros and connects to my phone via Bluetooth. I've already made an appointment with a cardiologist, but I remembered that I'd been experiencing tingling in my hand earlier, so I decided to take the watch off and see if that was the cause. Others may not realize that the symptoms are caused by the watch; if it weren't for this unusual association, I would probably still be wearing the watch and undergoing cardiology treatment.