Screenshots: the Bands' LED/PD arrays; Walking in-Zepp app of a daily 1-mile crisscross walk in my backyard (satellite view can be chosen, too; needs the phone's Bluetooth and cell or Wi-Fi connections plus enabled location service(s)).I posted a Band 5 review and Amazon won't allow one separate to it for the Band 7. So my Band 5 review follows these Band 5 vs Band 7 details. I used the Band 5 all of December, 2022 and then the Band 7 to date. I no longer have the 5, so I rely on my recollections.The physical differences for the two bands is self-evident. The Zepp app is really, really good IMHO.For the fitness/health feature sets and user interface, the Amazfit web site has plenty of info. The FAQs and Support pages are good but you need to really scrape around and dig for the it. There are gobs of online videos for these two bands. The Band 5 user PDF is awful.Presented here are the core components and workings of the two bands' stuff, a blend of Amazfit and searched-for online info and my observations, the later being to the best of my ability.Mobile device integration/sharing/etc, in-watch and in-Zepp Workout apps and Alexa are not discussed with the exception of the screenshot and this:I have observed when using the Walking app in the Band or the Zepp app, BPM is real-time! One might expect the same for the other apps. While the real-time data is recorded in Zepp's Homepage Workout History X-Y chart, the Homepage Heart Rate chart will be for the user selected 1,5, 10 or 30 minute intervals.• BPM & SpO2Band 5: An array of 2 LEDs and 1 PD (photo detector).Band 7: The same, redesigned.• Motion/movementBand 5: 3-axis gyroscopic sensorBand 7: Geomagnetic sensorBand 5 & 7: 3-axis acceleration sensor• Data engine algorithmsBand 5: BioTracker 2Band 7: BioTracker 3• Operating systemBand 5 & 7: Zepp OS•• Band 5 monitoring ••Same as Band 7 but no BPM Activity Detection Feature, I think.I can't recall if the Workout Walking app BPM was real-time.•• Band 7 monitoring ••-BPM, Stress, SpO2: 24 hour-BPM will update at user selected frequencies, when awake: 1, 5, 10 or 30 minutes. If set at the higher frequencies, the Activity Detection Feature sets at 1 minute for the duration of the activity. On-the-spot (manual) updates can be taken at any time. Band display of real time BPM display is not available, but real time is confirmed by me for the Workout Walking app.-Stress and SpO2 updates are 5 minutes only.-During sleep, BPM updates every minute, Stress and SpO4 update every 5 minutes.-While awake, on-the-spot (manual) updates can be taken; SpO2 requires up to 30 seconds, Stress needs all of 45 seconds, while keeping the arm at rest (motionless).-While awake, auto-updates will be taken if the arm is at rest (motionless) for five or more minutes and remains so for the 20 and 45 seconds needed.• Other-The 5 is sleek, the 7 is not.-Band 5 watch faces are far more available given its greater market place exposure. Band 7 may catch up in time.-Available Band 7 watch faces seriously lack component customization.-Band 7 replacement and designer bands have to catch up to the overwhelming choices available for the Band 5.-The timeline that defines sleep is fixed at midnight to 8 AM.-Sleep health data is a dubious, universally for all bands and watches across all price points.-The breathing health algorithm is beta as of this writing, but looks promising.• And-The reflectance driven BPM and Sp02 spot-check values match that of my FDA Class II transmittance EMAY EMO-80 pulse-oximeter. Given the near-instant transmittance sensors, today's reflectance sensors, other than being a bit slow, have come a long way for spot-checks.-I wore my Medline WR30M pedometer with each band for a week each and the distance, step count and BPM data matched the Bands' data pretty much spot on.-With 24/7 wear and all monitoring features enabled and daily half-hour use of the Walking in-watch app, my Band 7 battery alerts at the 20% level after 8-9 days (Bluetooth not used but for 1-2/day Zepp syncs). Using "fast" Nokia or RAVPower chargers, it takes 25 minutes to reach 50%. Another 15 to 75% and another 30 to 99% where it takes another 20 minutes to get to 100%. Regardless of the progress values reported, it's been a consistent 90 minutes from 20% to 100%.