Seems to have pretty good reviews and I’ve had good experience with Anker products. Lowest price ever according to CCC, not according to this old post. Still a pretty decent deal IMO.
Features:
• Heart rate monitor: 1S with optical heart rate sensor, shows you heart rate with PPG, you can see the results more intuitively.
• 10 days standby time: Top-level Bluetooth chip and military gravity sensor ensure 10 days ultra-long standby time for a full charging.
• Call reminder: Mi Band 1S will tell you when a call comes, you never need to worry about missing any important calls.