Quase uma Mi Band 2 da Xiaomi, com a diferença que ela mede além de sono, passos e batimentos cardíacos, também mede pressão arterial, se é melhor que a Mi Band 2 não sei mas o preço achei interessante e os reviews também.

Vídeo do Youtube com o comparitivo entres as duas em PT-BT:
https://www.youtube.com/watch?v=itUfDX-ExFI

Main Features:
● Health tracker
Real-time monitoring of heart rate, blood pressure, blood oxygen and sleep quality
● Manage your exercise
Built-in ADU motion sensor to record and remind you heart rate change to manage your exercise
● OLED screen
Simply touch to operate or lift your wrist to bright the wristband
● Push notification
Phone call, message and other notifications
● Skin-friendly material
The physical contact part of strap is mode of skin-friendly material, which is ventilated and sweatproof
● IP67 waterproof
IP67 standard protects the wristband form water and dust in daily use