Screen size
U7310Winner: 2.4"+38%
Watch Buds 21.5"
Quick verdict
Watch Buds 2 leads the measured specs 7-5.
Measured wins
U7310
5
spec wins
Ties
2
equal specs
Watch Buds 2
7
spec wins
Overall winner
Screen size
Technology
U7310
GSM / HSPA
Watch Buds 2
No cellular connectivity
2G bands
U7310
GSM 850 / 900 / 1800 / 1900
Watch Buds 2
N/A
3G bands
U7310
HSDPA 2100
Watch Buds 2
N/A
Speed
U7310
HSPA 3.6/0.384 Mbps
Watch Buds 2
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 Buds 2
N/A
GPRS
U7310
-
Watch Buds 2
No
EDGE
U7310
-
Watch Buds 2
No
Announced
U7310
2008, Q2
Watch Buds 2
2026, April 20
Status
U7310
Discontinued
Watch Buds 2
Available. Released 2026, April 20
Dimensions
U7310
103 x 45 x 14.5 mm, 66 cc (4.06 x 1.77 x 0.57 in)
Watch Buds 2
47 x 47 x 14.7 mm (1.85 x 1.85 x 0.58 in)
Weight
U7310
Watch Buds 2
54.5 g (1.90 oz)
SIM
U7310
Mini-SIM
Watch Buds 2
No
Build
U7310
-
Watch Buds 2
Titanium alloy frame, glass-fiber reinforced plastic back
Other
U7310
-
Watch Buds 2
Built-in wireless earbuds housed beneath the display; charging from the watch Compatible with standard 22mm straps
Type
U7310
TFT, 65K colors
Watch Buds 2
LTPO AMOLED, 3000 nits (peak)
Size
U7310
2.4 inches, 17.8 cm2 (~38.5% screen-to-body ratio)
Watch Buds 2
1.5 inches
Resolution
U7310
240 x 320 pixels, 4:3 ratio (~167 ppi density)
Watch Buds 2
466 x 466 pixels (~310 ppi density)
Card slot
U7310
microSD (dedicated slot)
Watch Buds 2
No
Phonebook
U7310
1000 entries
Watch Buds 2
-
Call records
U7310
20 dialed, 20 received, 20 missed calls
Watch Buds 2
-
Single
U7310
3.2 MP, AF
Watch Buds 2
-
Video
U7310
Yes
Watch Buds 2
-
Single
U7310
VGA videocall camera
Watch Buds 2
-
Video
U7310
Watch Buds 2
-
Loudspeaker
U7310
Yes
Watch Buds 2
No
3.5mm jack
U7310
No
Watch Buds 2
No
WLAN
U7310
No
Watch Buds 2
No
Bluetooth
U7310
1.2, A2DP
Watch Buds 2
5.2, A2DP, LE
Positioning
U7310
No
Watch Buds 2
GPS, GLONASS, GALILEO, BDS
Radio
U7310
FM radio
Watch Buds 2
No
USB
U7310
2.0
Watch Buds 2
No
NFC
U7310
-
Watch Buds 2
Yes
Sensors
U7310
Watch Buds 2
Accelerometer, gyro, heart rate, SpO2
Messaging
U7310
SMS, MMS, Email
Watch Buds 2
-
Browser
U7310
WAP 2.0/xHTML, RSS read
Watch Buds 2
-
Games
U7310
Yes
Watch Buds 2
-
Java
U7310
No
Watch Buds 2
-
Other
U7310
MP3/MP4/AAC player Predictive text input Organizer Photo editor Video streaming
Watch Buds 2
-
Type
U7310
Removable Li-Ion battery
Watch Buds 2
Li-Ion 410 mAh
Charging
U7310
-
Watch Buds 2
Wireless
Colors
U7310
Grey
Watch Buds 2
Black, Silver
Models
U7310
-
Watch Buds 2
LBA-B19
Price
U7310
-
Watch Buds 2
About 440 EUR
OS
U7310
-
Watch Buds 2
HarmonyOS
Other
U7310
-
Watch Buds 2
No