OnePlus 9 vs Xiaomi Watch S4 Specs Comparison

Availability

Officially announced
Mar 23, 2021
Prices (MSRP)
8GB/128GB - $729

Design

Dimensions
6.30 x 2.92 x 0.34 inches 160 x 74.2 x 8.7 mm	1.86 x 1.86 x 0.47 inches 47.3 x 47.3 x 12 mm
Weight
6.77 oz / 192.0 g	1.57 oz / 44.5 g
Materials
Back: Glass (Corning Gorilla Glass) Frame: Aluminum	Back: Aluminum
Resistance
	50m/5ATM water resistance
Biometrics
2D Face unlock, Optical in-screen fingerprint
Keys
Left: Volume control; Right: Lock/Unlock key, Other
Colors
Winter Mist, Arctic Sky, Astral Black	Black, Silver

Display

Size
6.5-inch, 87.27% screen-to-body	1.4-inch
Type
AMOLED, 120Hz, HDR	AMOLED, 2200 nits
Resolution
2400x1080px, 20:9 ratio, 402 PPI	466x466px, 461 PPI
Protection
Corning Gorilla Glass

PhoneArena Display Test

Bright Max (20% APL)
Untested	Untested
Bright Min
2.5 (Average)	Untested

Learn more on our PhoneArena Display Test Results page.

Hardware

System chip
Snapdragon 888 (5 nm)
Processor
Octa-core Kryo 680
GPU
Adreno 660
Memory
8GB (LPDDR5)/128GB (UFS 3.1) 12GB/256GB
Storage expansion
not expandable
OS
Android (11)

Battery

Type
4500 mAh	486 mAh, Li - Polymer
Charging
OnePlus Warp Charge Qi wireless charging
Charge speed
Wired: 65.0W Wireless: 15.0W

PhoneArena Battery Tests

Battery Life Estimate

5h 50min

Browsing

11h 29min

Video

9h 16min

Gaming

9h 6min

Battery Life Estimate

Untested

Browsing

Untested

Video

Untested

Gaming

Untested

Learn more on our PhoneArena Battery Test Results page

Camera

Rear
Triple camera
Main camera
48 MP (PDAF) Aperture size: F1.8 Focal length: 23 mm Sensor size: 1/1.4" Pixel size: 1.12 μm
Second camera
50 MP (Ultra-wide) Aperture size: F2.2 Focal Length: 14 mm Sensor size: 1/1.56"
Third camera
2 MP (Black and White)
Flash
Dual LED
Video recording
8K UHD (30 fps), 4K UHD (60 fps), 1080p (240 fps), 720p (480 fps) HDR, Continuous autofocus, EIS
Front
16 MP (EIS)

Connectivity & Features

Bluetooth
5.2	5.3
WLAN
Wi-Fi 6,dual-band MIMO, Wi-Fi Direct, Hotspot 802.11 a, b, g, n, ac, ax
USB
Type-C, USB 3.1
Sensors
Accelerometer, Gyroscope, Compass, Ambient light sensor, Proximity sensor	Accelerometer, Gyroscope, Compass, Heart rate, Blood Oxygen
Location
GPS, A-GPS, Glonass, Galileo, BeiDou, Cell ID, Wi-Fi positioning	GPS, A-GPS, Galileo, BeiDou, QZSS
Other
NFC	NFC

Multimedia

Headphones
No 3.5mm jack
Speakers
Earpiece, Loudspeaker, Multiple speakers
Features
Dolby Atmos

Cellular

5G Bands
n1, n2, n3, n5, n7, n8, n20, n25, n28, n38, n40, n41, n48, n66, n71, n77, n78
LTE Bands
1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 18, 19, 20, 25, 26, 28, 30, 32, 66, 71
TDD Bands
38, 39, 40, 41, 46, 48
3G Bands
1, 2, 4, 5, 8, 9, 19
Data Speed
LTE-A Pro Cat 20 (2000/150 Mbit/s), HSDPA+ (4G) 42.2 Mbit/s, HSUPA 5.76 Mbit/s, UMTS	LTE, HSDPA+ (4G) 42.2 Mbit/s
SIM type
Nano SIM	eSIM

Regulatory Approval

FCC approval
Date approved: Mar 24, 2021 FCC ID value: 2ABZ2-EF136
Measured SAR
Head: 1.20 W/kg Body: 0.78 W/kg Simultaneous Transmission: 1.48 W/kg Wireless Router: 1.18 W/kg

Alternative variants

With 12GB RAM and 256GB storage

Memory	12GB/256GB
Prices (MSRP)	$829

Discover more

Full Specs OnePlus 9 Specs PA Review OnePlus 9 Review

Full Specs Xiaomi Watch S4 Specs