I picked the HF03X from Gearbest because it seems to have all the right features in a smartwatch/smartband at a reasonable price. Colour, decent battery charge life, pulse, blood pressure, oxygen levels, sleep, sport, notifications, alarm etc. The last watch from GearBest was the Xiaomi Mi 3 – lovely, gets daily use but it is monochrome. That hasn't stopped my wife loving it but I think that's about to change? Of course, one has to have a working watch and a going out watch so there's room for both.
There’s a single touch point near the bottom of the HF03X colour screen. Pressing that for 3 seconds starts the watch and the screen lights up. The green heart rate sensor is, as usual on the underside of the watch body.