Activity band that keeps logging for a week before it needs the cable

The band records heart rate, sleep and movement through the day and hands it to an app over Bluetooth 5.0. A 200 mAh cell covers roughly seven days and tops up over USB. Total weight is around 50 grams including the silicone strap, light enough to leave on overnight.

Why choose this activity band?

A tracker that has to sit on a charger every night is a tracker that never sees how you sleep. A week of runtime keeps the record unbroken. The display shows the day's figures directly instead of hiding them two menus deep.

Week-long runtime: around seven days from a full charge, refilled over USB.
Continuous logging: heart rate and sleep recorded through the night as well as the day.
IP68 sealed: rain, sweat and a splash at the kitchen tap are not a problem.
Bluetooth 5.0 sync: pairs with iOS 9.0 and Android 5.0 or later.
Silicone strap: 50 grams all in, adjustable from 15 to 20 cm.

A quiet week-by-week record that asks almost nothing of you.

Sit it about a finger's width up from the wrist bone, close enough that the sensor keeps contact when you move. Pair it once and the app picks up new data on its own whenever the phone is in range. Dry the underside after a workout so the strap stays comfortable against the skin.