Screen size
U7310Winner: 2.4"+24%
Watch Fit 41.8"
Quick verdict
Watch Fit 4 leads the measured specs 9-4.
Measured wins
U7310
4
spec wins
Ties
2
equal specs
Watch Fit 4
9
spec wins
Overall winner
Screen size
Technology
U7310
GSM / HSPA
Watch Fit 4
No cellular connectivity
2G bands
U7310
GSM 850 / 900 / 1800 / 1900
Watch Fit 4
N/A
3G bands
U7310
HSDPA 2100
Watch Fit 4
N/A
Speed
U7310
HSPA 3.6/0.384 Mbps
Watch Fit 4
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
3.5mm jack
equal specsSD card
Stereo speakers
No
4G bands
U7310
-
Watch Fit 4
N/A
GPRS
U7310
-
Watch Fit 4
No
EDGE
U7310
-
Watch Fit 4
No
Announced
U7310
2008, Q2
Watch Fit 4
2025, May 15
Status
U7310
Discontinued
Watch Fit 4
Available. Released 2025, May 26
Dimensions
U7310
103 x 45 x 14.5 mm, 66 cc (4.06 x 1.77 x 0.57 in)
Watch Fit 4
43 x 38 x 9.5 mm (1.69 x 1.50 x 0.37 in)
Weight
U7310
Watch Fit 4
27 g (0.95 oz)
SIM
U7310
Mini-SIM
Watch Fit 4
No
Build
U7310
-
Watch Fit 4
Glass front, aluminum alloy frame, plastic back
Other
U7310
-
Watch Fit 4
5 ATM water resistant
Type
U7310
TFT, 65K colors
Watch Fit 4
AMOLED, 2000 nits (peak)
Size
U7310
2.4 inches, 17.8 cm2 (~38.5% screen-to-body ratio)
Watch Fit 4
1.82 inches
Resolution
U7310
240 x 320 pixels, 4:3 ratio (~167 ppi density)
Watch Fit 4
480 x 408 pixels (~347 ppi density)
Card slot
U7310
microSD (dedicated slot)
Watch Fit 4
No
Phonebook
U7310
1000 entries
Watch Fit 4
No
Call records
U7310
20 dialed, 20 received, 20 missed calls
Watch Fit 4
No
Internal
U7310
-
Watch Fit 4
Unspecified
Single
U7310
3.2 MP, AF
Watch Fit 4
-
Video
U7310
Yes
Watch Fit 4
-
Single
U7310
VGA videocall camera
Watch Fit 4
-
Video
U7310
Watch Fit 4
-
Loudspeaker
U7310
Yes
Watch Fit 4
Yes
3.5mm jack
U7310
No
Watch Fit 4
No
WLAN
U7310
No
Watch Fit 4
No
Bluetooth
U7310
1.2, A2DP
Watch Fit 4
5.2, LE
Positioning
U7310
No
Watch Fit 4
GPS (L1+L5), GALILEO (E1+E5a), QZSS (L1+L5), BDS (B1l+B1C), GLONASS
Radio
U7310
FM radio
Watch Fit 4
No
USB
U7310
2.0
Watch Fit 4
No
NFC
U7310
-
Watch Fit 4
Yes (gray model only)
Sensors
U7310
Watch Fit 4
Accelerometer, gyro, heart rate, SpO2, compass, barometer
Messaging
U7310
SMS, MMS, Email
Watch Fit 4
Email, IM
Browser
U7310
WAP 2.0/xHTML, RSS read
Watch Fit 4
-
Games
U7310
Yes
Watch Fit 4
No
Java
U7310
No
Watch Fit 4
No
Other
U7310
MP3/MP4/AAC player Predictive text input Organizer Photo editor Video streaming
Watch Fit 4
Pulse wave arrhythmia analysis
Type
U7310
Removable Li-Ion battery
Watch Fit 4
Li-Ion 400 mAh
Charging
U7310
-
Watch Fit 4
5W wireless
Colors
U7310
Grey
Watch Fit 4
Black, Silver
Models
U7310
-
Watch Fit 4
SYA-B19
Price
U7310
-
Watch Fit 4
$ 121.00 / € 104.76
Other
U7310
-
Watch Fit 4
No