Low-cost tracker. A fitness wristband for roughly 20 Euros with OLED panel, heart-rate monitor, IP67 certification and a battery life of over 20 days? The Chinese manufacturer Xiaomi makes it possible. We tested Xiaomi's Mi Band 2, and report how it fares in everyday use.
http://www.notebookcheck.net/Xiaomi-Mi-Band-2-Smartband-Review.168722.0.html
If you could please provide me with the link from the product where the price is 20 Euros.
I would be extremely grateful :)
I might get one from Geekbuying now that they dropped in price, it's only $27.
You can get them from gearbest as well, got mine for around £21. Haven't received it yet but looking forward to it!