To the best of my knowledge, pressing a physical button on the Mi Band 2 enabled users to intercept events. However, this functionality is not available on the Mi Band 3, and while some third-party applications may still be able to do so, doing so will significantly drain the battery. The heart rate monitor on this device is just as incorrect or accurate as the one on 90% of other fitness bracelets or smartwatches; therefore, it is best to get a separate heart rate monitor that has a sensor that can be mounted to the chest in order to use it for sports. It is my understanding that the accelerometer, and not the pulse, is what is used to track sleep over the night, and that the pulse is not used to do so (although I do not know how to identify the sleep phase using the pulse).
Canon Nikon Sony Panasonic FujiFilm Olympus Pentax DSLR Camera Bag, Evecase Large Vintage Canvas Messenger SLR Shoulder Strap Case - Gray
45 Review
Protect Your Earbuds On-The-Go With Small And Portable EVA Case - Perfect For Airpods, USB Drives, Cables And More!
34 Review
Classic Camera Bag, Evecase Large Canvas Messenger SLR/DSLR Shoulder Case With Leather Trim, Tablet Compartment And Removable Insert For Mirrorless, Micro 4/3, Compact System, High Zoom Digital Camera
41 Review
A Durable And Protective CaseSack For Bose QuietComfort And SoundLink Headphones
41 Review