Screen size
U1Winner: 1.9"+12%
W031.7"
Quick verdict
U1 leads the measured specs 6-2.
Measured wins
U1
6
spec wins
Overall winner
Ties
4
equal specs
W03
2
spec wins
Screen size
Technology
U1
No cellular connectivity
W03
No cellular connectivity
2G bands
U1
N/A
W03
N/A
3G bands
U1
N/A
W03
N/A
4G bands
U1
N/A
W03
N/A
Resolution
Refresh rate
Peak brightness
Pixel density
CPU speed
RAM
Storage
Main camera
Front camera
Battery
Wired charging
Weight
Thickness
IP rating
Wi‑Fi
Bluetooth
USB
5G support
equal specsNFC
equal specs3.5mm jack
equal specsSD card
equal specsStereo speakers
Speed
U1
No
W03
No
GPRS
U1
No
W03
No
EDGE
U1
No
W03
No
Announced
U1
2025, February
W03
2021
Status
U1
Available. Released 2025, February
W03
Available. Released 2021
Dimensions
U1
49.8 x 42.4 x 11.4 mm (1.96 x 1.67 x 0.45 in)
W03
43 x 43 x 12 mm (1.69 x 1.69 x 0.47 in)
Weight
U1
43.8 g (1.55 oz)
W03
-
SIM
U1
No
W03
No
Other
U1
Waterproof (1ATM)
W03
IP68 dust tight and water resistant (immersible up to 1.5m for 30 min)
Build
U1
-
W03
Glass front, aluminum frame, plastic back
Type
U1
TFT LCD
W03
TFT LCD
Size
U1
1.93 inches
W03
1.7 inches
Resolution
U1
240 x 288 pixels (~194 ppi density)
W03
240 x 240 pixels (~200 ppi density)
Protection
U1
-
W03
Scratch-resistant glass
OS
U1
Proprietary OS
W03
Proprietary OS
Card slot
U1
No
W03
No
Internal
U1
16MB
W03
-
Other
U1
No
W03
No
Loudspeaker
U1
Yes
W03
No
3.5mm jack
U1
No
W03
No
WLAN
U1
No
W03
No
Bluetooth
U1
5.4, A2DP, LE
W03
5.1, A2DP, LE
Positioning
U1
No
W03
No
NFC
U1
No
W03
No
Radio
U1
No
W03
No
USB
U1
No
W03
No
Sensors
U1
Accelerometer, gyro, heart rate, SpO2
W03
Accelerometer, gyro, heart rate
Type
U1
300 mAh
W03
260 mAh
Colors
U1
Black, Pink
W03
Black, Blue, Pink