Haylou · 2021
GST Size, Dimensions & Wrist Fit
Case Width
35.6mm
Thickness
11.7mm
Lug-to-Lug
45.7mm
Weight
42g
The GST looks in proportion on wrists of 14–20 cm (5.5–7.9 in) round, and fills the wrist at 15–16.5 cm (45.7mm lug to lug).
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Does the GST fit your wrist?
| Wrist round (mm left each side) | 35.6mm |
|---|---|
| 14 cm / 5.5 in | Overhangs (0.3mm over) |
| 15 cm / 5.9 in | Sweet spot (1.3mm) |
| 16 cm / 6.3 in | Sweet spot (3mm) |
| 17 cm / 6.7 in | Balanced (4.6mm) |
| 18 cm / 7.1 in | Balanced (6.2mm) |
| 19 cm / 7.5 in | Balanced (7.8mm) |
| 20 cm / 7.9 in | Balanced (9.4mm) |
The GST in short
- Rated for 9 days of use per charge.
- Water resistant; no depth rating published.
- 42g on the wrist.
- 1.69 inches LCD display.
- Takes 20mm bands, so third-party straps fit without an adapter.
Compare with another watch
Size, fit and battery side by side, against any smartwatch we list.
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GST battery life
Published runtime
- Battery life9 days
Where it ranks among Haylou watches
- Everyday use9 days#10 of 10
- Capacity220 mAh#8 of 10
Settings to change and the 24-hour idle test are on the battery check.
2D Dimension Schematics
- Haylou GST 35.6mm × 45.7mm · 11.7mm thick
3D preview
Haylou GST on a wrist
What size band does the GST take?
Lug width
20mm
Alternatives to the GST
GST specifications
- Battery life
- 9 days
- Display
- 1.69 inches
- Resolution
- 240 x 280 px
- Water rating
- Water resistant
- Strap
- 20 mm
Show all specificationsHaylou's published specification, for reference · checked September 2026
Design
- width
- 35.6
- height
- 45.7
- volume
- 19.03 cm³
- weight
- 42 g
- thickness
- 11.7
- resolution
- 240 x 280 px
- screen size
- 1.69 inches
- Display type
- LCD
- Has a display
- Yes
- pixel density
- 218 ppi
- width of band
- 20 mm
- water resistance
- Water resistant
- Always-On Display
- No
- has a touch screen
- Yes
- Watch band is replaceable
- Yes
- Has sapphire glass display
- No
- maximum operating temperature
- 40 °C
- has branded damage-resistant glass
- No
- lowest potential operating temperature
- 0 °C
Battery
- battery life
- 9 days
- battery power
- 220 mAh
- has wireless charging
- Yes
- has a removable battery
- No
- Has a solar power battery
- No
- has a rechargeable battery
- Yes
Sensors
- has GPS
- No
- has a compass
- No
- Has a barometer
- No
- has a gyroscope
- No
- Has a cadence sensor
- No
- has an accelerometer
- Yes
- Monitors perspiration
- No
- Has a heart rate monitor
- Yes
- Has a temperature sensor
- No
- Monitors blood oxygenation levels
- Yes
Features
- release date
- 2021-12-21
- Has a stopwatch
- Yes
- Has smart alarm
- No
- Has call control
- No
- Has silent alarm
- Yes
- Has notifications
- No
- Has ECG technology
- No
- Locates your phone
- No
- has fall detection
- No
- has voice commands
- No
- Acquires GPS faster
- No
- Has vibrating alerts
- No
- Can be used to answer calls
- No
- has irregular heart rate warnings
- No
- Has a built-in camera remote control function
- No
Connectivity
- has NFC
- No
- supports ANT+
- No
- supports Wi-Fi
- No
- Bluetooth version
- 5.1
- has a cellular module
- No
- Is compatible with iOS
- Yes
- Is compatible with Android
- Yes
Miscellaneous
- Is compatible with Windows
- Yes
- Is compatible with Mac OS X
- No
- has an external memory slot
- No
- has a battery level indicator
- Yes
- has a socket for a 3.5 mm audio jack
- No
App & Software
- Has achievements
- Yes
- Has goal setting
- Yes
- Has weight tracking
- Yes
- Tracks water intake
- Yes
- Has inactivity alerts
- Yes
- Has temperature tracking
- No
- Provides activity reports
- Yes
- Counts how many calories you've burned
- Yes
Activity tracking
- Measures pace
- No
- Tracks distance
- No
- Tracks elevation
- No
- Designed for golf
- No
- Tracks your sleep
- Yes
- Tracks steps taken
- Yes
- Designed for diving
- No
- Has a route tracker
- No
- Has exercise tagging
- Yes
- Has multi-sport mode
- No
- Tracks calorie intake
- Yes
- Provides sleep reports
- Yes
- Detects activities automatically
- Yes
- Has a stroke counter for swimming
- No
