Screen size
Smart Watch1.3"
U1Winner: 1.9"+33%
Quick verdict
U1 leads the measured specs 6-2.
Measured wins
Smart Watch
2
spec wins
Ties
4
equal specs
U1
6
spec wins
Overall winner
Screen size
Technology
Smart Watch
No cellular connectivity
U1
No cellular connectivity
2G bands
Smart Watch
N/A
U1
N/A
3G bands
Smart Watch
N/A
U1
N/A
4G bands
Smart Watch
N/A
U1
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
N/A
Speed
Smart Watch
No
U1
No
GPRS
Smart Watch
No
U1
No
EDGE
Smart Watch
No
U1
No
Announced
Smart Watch
2020. Released 2020
U1
2025, February
Status
Smart Watch
Discontinued
U1
Available. Released 2025, February
Dimensions
Smart Watch
41.6 x 41.6 x 11.6 mm (1.64 x 1.64 x 0.46 in)
U1
49.8 x 42.4 x 11.4 mm (1.96 x 1.67 x 0.45 in)
Weight
Smart Watch
-
U1
43.8 g (1.55 oz)
SIM
Smart Watch
No
U1
No
Other
Smart Watch
IP68 dust tight and water resistant (immersible up to 1.5m for 30 min) Waterproof (5ATM)
U1
Waterproof (1ATM)
Type
Smart Watch
TFT LCD
U1
TFT LCD
Size
Smart Watch
1.3 inches
U1
1.93 inches
Resolution
Smart Watch
240 x 240 pixels (~261 ppi density)
U1
240 x 288 pixels (~194 ppi density)
Protection
Smart Watch
Scratch-resistant glass
U1
-
OS
Smart Watch
Proprietary OS
U1
Proprietary OS
Card slot
Smart Watch
No
U1
No
Internal
Smart Watch
-
U1
16MB
Other
Smart Watch
No
U1
No
Loudspeaker
Smart Watch
No
U1
Yes
3.5mm jack
Smart Watch
No
U1
No
WLAN
Smart Watch
No
U1
No
Bluetooth
Smart Watch
5.0, A2DP, LE
U1
5.4, A2DP, LE
Positioning
Smart Watch
No
U1
No
NFC
Smart Watch
No
U1
No
Radio
Smart Watch
No
U1
No
USB
Smart Watch
No
U1
No
Sensors
Smart Watch
Accelerometer, gyro, heart rate
U1
Accelerometer, gyro, heart rate, SpO2
Type
Smart Watch
210 mAh
U1
300 mAh
Colors
Smart Watch
Black, Pink
U1
Black, Pink