Amazfit Helio Strap

Works with: iPhone and Android
Display: none
Battery: 10 days
Water resistance: 5 ATM
Weight: 20 g

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Amazfit Helio Strap at a glance

Battery

Around two weeks

Up to 10 days in smartwatch mode.
GPS

Uses your phone's GPS

Carry your phone to map a workout.
Display

No screen

Screen-free: you check everything in the phone app.
Health

Heart, sleep and more

Measures blood oxygen, skin temperature and HRV.
Phone & smart

iPhone and Android

Notifications from your phone.
Build

5 ATM water rating

20 g.

Amazfit Helio Strap full specifications

Overview

Brand	Amazfit
Model	Helio Strap
Series	Helio
Colours	Black

Platform & apps

Works with iPhone and Android phones.

No subscription needed.

Works with	iPhone and Android
Minimum iOS	iOS 15
Minimum Android	Android 7
Subscription	Not needed

Display

No screen at all: the band tracks in the background and the app shows your data.

Display type	None
Colour display	No
Touchscreen	No

Design & durability

Weighs 20 g.

Rated 5 ATM: fine for swimming laps and showers.

Case shape	Band
Dimensions	33.97 x 24.3 x 10.59 mm
Thickness	10.59 mm
Weight (case)	20 g
Case material	fiber-reinforced polymer
Band material	Nylon
Band width	22 mm
Fits wrists	145-205 mm
Water resistance	5 ATM
Water standard	ISO 22810:2010

Battery

Around two weeks: up to 10 days in smartwatch mode.

Real battery life depends on screen brightness, notifications and workouts.

Battery (smartwatch mode)	10 days
All battery modes	Smartwatch: 10 days
Battery capacity	232 mAh
Charging	puck

GPS & navigation

Uses your phone's GPS, so carry the phone to map a run or ride.

GPS	Uses phone GPS

Health & sensors

Tracks heart rate around the clock, plus blood oxygen, skin temperature and HRV.

For sleep, it offers a nightly sleep score.

Sensors	optical HR, SpO2, skin temperature, accelerometer, gyroscope
Heart-rate sensor	BioTracker 6.0 PPG
Heart-rate tracking	24/7
High/low heart-rate alerts	Yes
Heart-rate variability	Yes
Blood oxygen (SpO2)	Yes
Skin temperature	Yes
Sleep tracking	Sleep score
Stress tracking	Yes
Energy score	BioCharge

Training

Tracks 50+ sports and activities.

Sport profiles	50
Training metrics	VO2 max, training load, training effect, recovery time
Strength rep counting	Yes
Heart-rate broadcast	Yes

Smart features

Notifications	No
Bluetooth	Bluetooth 5.2

Diving, golf & more

Diving	None

Specs compiled from Amazfit's product pages and datasheets, with some identifiers from Open Icecat. Manufacturers revise hardware between versions, so check the version on the box. Spotted an error? Tell us.