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Why this one

The point of it is that you stop noticing it.

Forty grams, a woven strap and a machined case with no display on it. It reads your heart and your movement around the clock so that the app has something honest to work from, then it gets out of the way.

There is no screen, so there is nothing to check, nothing to notify you and nothing to charge every night. Fifteen minutes on the magnetic connector covers about a week of wear.

What it does that a phone cannot

  • Overnight heart rate and HRV, which recovery is worked out from, and sleep timing, which the sleep score is worked out from
  • Live heart rate streamed into the app while you train
  • Workouts started from the app rather than from a watch
  • A silent alarm that vibrates on your wrist

What it is not

  • Not a smartwatch. No display, no notifications, no apps
  • Not for swimming. 1 ATM is splash and rain, not immersion
  • Not a medical device, and nothing it reports is a diagnosis
  • Not required for food logging, trends, habits or the coach

Specification

Weight

40 g

Battery

21+ days

15 minutes of charge is about a week

Water resistance

1 ATM

Splash-proof, not for swimming

Charging

Magnetic

Pogo-pin connector

Connectivity

Bluetooth LE

Sync

iOS and Android

Screen

None

By design

Warranty

1 year

Limited

From the internal band hardware record. Not independently re-measured for this rebuild. The earlier claim of clinical-grade sensor accuracy is not repeated here because it has no supporting evidence on file.

In the box

  • Penng band
  • Magnetic charging cable
  • Quick start guide
  • Warranty card

Packaging is recycled cardboard and plastic-free.

Questions