Screen size
C31.3"
U1Winner: 1.9"+33%
Quick verdict
U1 leads the measured specs 6-2.
Measured wins
C3
2
spec wins
Ties
4
equal specs
U1
6
spec wins
Overall winner
Screen size
Technology
C3
No cellular connectivity
U1
No cellular connectivity
2G bands
C3
N/A
U1
N/A
3G bands
C3
N/A
U1
N/A
4G bands
C3
N/A
U1
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
C3
No
U1
No
GPRS
C3
No
U1
No
EDGE
C3
No
U1
No
Announced
C3
2020. Released 2020
U1
2025, February
Status
C3
Discontinued
U1
Available. Released 2025, February
Dimensions
C3
46 x 46 x 14.8 mm (1.81 x 1.81 x 0.58 in)
U1
49.8 x 42.4 x 11.4 mm (1.96 x 1.67 x 0.45 in)
Weight
C3
-
U1
43.8 g (1.55 oz)
SIM
C3
No
U1
No
Other
C3
IP68 dust tight and water resistant (immersible up to 1.5m for 30 min) Waterproof (5ATM) 50m water resistant
U1
Waterproof (1ATM)
Type
C3
TFT LCD
U1
TFT LCD
Size
C3
1.3 inches
U1
1.93 inches
Resolution
C3
240 x 240 pixels (~261 ppi density)
U1
240 x 288 pixels (~194 ppi density)
Protection
C3
Scratch-resistant glass
U1
-
OS
C3
Proprietary OS
U1
Proprietary OS
Card slot
C3
No
U1
No
Internal
C3
-
U1
16MB
Other
C3
No
U1
No
Loudspeaker
C3
No
U1
Yes
3.5mm jack
C3
No
U1
No
WLAN
C3
No
U1
No
Bluetooth
C3
5.1, A2DP, LE
U1
5.4, A2DP, LE
Positioning
C3
No
U1
No
NFC
C3
No
U1
No
Radio
C3
No
U1
No
USB
C3
No
U1
No
Sensors
C3
Accelerometer, gyro, heart rate
U1
Accelerometer, gyro, heart rate, SpO2
Type
C3
260 mAh
U1
300 mAh
Colors
C3
Black, Gray
U1
Black, Pink