Frequently Asked Questions
The Pro device is for the data lovers out there. The Pro can sync your data to a web dashboard where you can analyze, graph and export your data into other 3rd party programs.
Your Pro also comes with more memory (128 MB vs 64 MB) so it can record without syncing to the app for up to a month. Never lose your data!Last updated:
Wrist-worn heart rate monitors can give you average heart rate over a period of time, but to calculate HRV you need millisecond timing accuracy from heartbeat to heartbeat.
The Lief uses the electrocardiogram or ECG signal, the medical gold standard sensor for HRV measurement. ECG is simply the only way to accurately and reliably calculate your HRV. In addition, Lief is placed close to your the heart which increases signal strength significantly.
See this white paper on accuracy differences between the Fitbit Surge and medical ECG sensors: http://getlief.com/static/papers/Fitbit_Validation_Study.pdfLast updated:
You can wear the Lief at night to record your HRV, heart rate, breathing and movement while you sleep. There is strong evidence that low HRV during the day can lead to poor sleep quality at night. You can track and optimize your sleep quality with the Lief's day-time and night-time data.
Lief does not explicitly analyze your sleep stages and quality, but all your data is available to you in the app (and with the Pro, exportable to 3rd party programs for deeper analysis.) Optionally, wear your Lief in airplane mode to turn off the Bluetooth radio, then sync with your phone when you wake up the next day.Last updated:
This is a common question. Most wellness-focused wearables out there alert you when you're stressed. There's no clear next step to take, so the tension can be compounded.
The Lief is different - it doesn't just monitor your stress, it's a real-time, in-the-moment exercise that makes you feel better, even when you're not feeling your best.Last updated:
Lief uses standard ECG stickers so you can use any of dozens of cheap, easily available brands. Searching for "ECG electrodes" on Amazon brings up results in the 20-30 cent per sticker range, and you can save by buying in bulk.
We tested dozens of different stickers, and the daily use brand included with your Lief were the preferred choice of our pilot users. While we will supply these skin-safe, medical-grade stickers to you as an ongoing convenience service, most standard “ECG electrodes” on Amazon work with Lief and you are not locked in to us.
We're currently working with Somaxis, a bio-monitoring device company, to create what we feel is "the perfect sticker" for all day use. These will be offered as soon as they become available as an additional option and similar price point to existing brands.Last updated:
Lief uses standard medical ECG stickers, and there are dozens of major brands for every skin type and use case. The stickers we ship with your Lief are recommended for daily use, but other ECG stickers available on Amazon can last up to week.
A big part of the answer to this question is, it depends on your own preferences and skin type. For people with very sensitive skin, we recommend pediatric stickers that you throw away daily.Last updated:
Yes. Your Lief can be placed in Airplane Mode, which means the radio will remain turned off and all data will simply be stored to local flash. When you have a need to connect to your app or sync data, just hit the Lief's button three times to turn Airplane Mode off.
Lief retains its core functionality independently of your phone or a Bluetooth connection, so you can reduce your total EMF exposure and still gain most of the utility of the patch.Last updated:
The Lief runs on a lithium polymer battery, which typically supports 300-400 charges over the course of its life. In monitoring mode, your Lief can last up to a week without charging, so we estimate the Lief's battery will last 3-5 years with normal use.Last updated:
Yes, the Lief companion app will support both Apple and Android devices. Windows phones and other smartphones are not currently supported.Last updated:
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