Screen size
U1Winner: 1.9"+10%
X31.7"
Quick verdict
U1 leads the measured specs 4-3.
Measured wins
U1
4
spec wins
Overall winner
Ties
4
equal specs
X3
3
spec wins
Screen size
Technology
U1
No cellular connectivity
X3
No cellular connectivity
2G bands
U1
N/A
X3
N/A
3G bands
U1
N/A
X3
N/A
4G bands
U1
N/A
X3
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
X3
No
GPRS
U1
No
X3
No
EDGE
U1
No
X3
No
Announced
U1
2025, February
X3
2025, March
Status
U1
Available. Released 2025, February
X3
Available. Released 2025, March
Dimensions
U1
49.8 x 42.4 x 11.4 mm (1.96 x 1.67 x 0.45 in)
X3
53.8 x 53.8 x 13.5 mm (2.12 x 2.12 x 0.53 in)
Weight
U1
43.8 g (1.55 oz)
X3
94.6 g (3.35 oz)
SIM
U1
No
X3
No
Other
U1
Waterproof (1ATM)
X3
Waterproof (5ATM)
Build
U1
-
X3
Zinc alloy frame and rear
Type
U1
TFT LCD
X3
TFT LCD
Size
U1
1.93 inches
X3
1.73 inches
Resolution
U1
240 x 288 pixels (~194 ppi density)
X3
466 x 466 pixels (~381 ppi density)
OS
U1
Proprietary OS
X3
Proprietary OS
Card slot
U1
No
X3
No
Internal
U1
16MB
X3
16MB
Other
U1
No
X3
No
Loudspeaker
U1
Yes
X3
Yes
3.5mm jack
U1
No
X3
No
WLAN
U1
No
X3
No
Bluetooth
U1
5.4, A2DP, LE
X3
5.3, A2DP
Positioning
U1
No
X3
Unspecified
NFC
U1
No
X3
No
Radio
U1
No
X3
No
USB
U1
No
X3
No
Sensors
U1
Accelerometer, gyro, heart rate, SpO2
X3
Accelerometer, heart rate, SpO2, barometer, compass
Type
U1
300 mAh
X3
900 mAh
Colors
U1
Black, Pink
X3
Black