I bought a Colmi R09 “smart” ring from AliExpress, and I’ve been giving it a try for the last couple of weeks. For £18 (being AliExpress, the price fluctuates a bit), I didn’t have particularly high expectations, and I have been pleasantly surprised. The ring The ring is slightly concave, and black. It does not stand out / look unusual, although when it takes some measurements, the LEDs pulse on the underside of your finger, which I guess could be visible. This one has no screen or o...
