Screen size
U3100Winner: 2.0"+25%
Watch Buds 21.5"
Quick verdict
Watch Buds 2 leads the measured specs 6-5.
Measured wins
U3100
5
spec wins
Ties
2
equal specs
Watch Buds 2
6
spec wins
Overall winner
Screen size
Technology
U3100
GSM / UMTS
Watch Buds 2
No cellular connectivity
2G bands
U3100
GSM 900 / 1800 / 1900
Watch Buds 2
N/A
3G bands
U3100
UMTS 2100
Watch Buds 2
N/A
Speed
U3100
Yes, 384 kbps
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
U3100
-
Watch Buds 2
N/A
GPRS
U3100
-
Watch Buds 2
No
EDGE
U3100
-
Watch Buds 2
No
Announced
U3100
2010. Released 2010
Watch Buds 2
2026, April 20
Status
U3100
Discontinued
Watch Buds 2
Available. Released 2026, April 20
Dimensions
U3100
106 x 46 x 13 mm (4.17 x 1.81 x 0.51 in)
Watch Buds 2
47 x 47 x 14.7 mm (1.85 x 1.85 x 0.58 in)
Weight
U3100
90 g (3.17 oz)
Watch Buds 2
54.5 g (1.90 oz)
SIM
U3100
Mini-SIM
Watch Buds 2
No
Build
U3100
-
Watch Buds 2
Titanium alloy frame, glass-fiber reinforced plastic back
Other
U3100
-
Watch Buds 2
Built-in wireless earbuds housed beneath the display; charging from the watch Compatible with standard 22mm straps
Type
U3100
TFT, 256K colors
Watch Buds 2
LTPO AMOLED, 3000 nits (peak)
Size
U3100
2.0 inches, 12.4 cm2 (~25.4% screen-to-body ratio)
Watch Buds 2
1.5 inches
Resolution
U3100
240 x 320 pixels, 4:3 ratio (~200 ppi density)
Watch Buds 2
466 x 466 pixels (~310 ppi density)
Card slot
U3100
microSDHC (dedicated slot)
Watch Buds 2
No
Phonebook
U3100
Yes, Photocall
Watch Buds 2
-
Call records
U3100
Yes
Watch Buds 2
-
Internal
U3100
10MB
Watch Buds 2
-
Single
U3100
VGA
Watch Buds 2
-
Video
U3100
Yes
Watch Buds 2
-
Single
U3100
Yes
Watch Buds 2
-
Video
U3100
Watch Buds 2
-
Loudspeaker
U3100
Yes
Watch Buds 2
No
3.5mm jack
U3100
No
Watch Buds 2
No
WLAN
U3100
No
Watch Buds 2
No
Bluetooth
U3100
2.0, EDR
Watch Buds 2
5.2, A2DP, LE
Positioning
U3100
GPS, A-GPS
Watch Buds 2
GPS, GLONASS, GALILEO, BDS
Radio
U3100
FM Radio
Watch Buds 2
No
USB
U3100
miniUSB 2.0
Watch Buds 2
No
NFC
U3100
-
Watch Buds 2
Yes
Sensors
U3100
Watch Buds 2
Accelerometer, gyro, heart rate, SpO2
Messaging
U3100
SMS(threaded view), MMS, Email, IM
Watch Buds 2
-
Browser
U3100
HTML
Watch Buds 2
-
Games
U3100
Yes
Watch Buds 2
-
Java
U3100
Yes
Watch Buds 2
-
Other
U3100
MP3/eAAC+ player MP4/H.264 player Voice memo Predictive text input
Watch Buds 2
-
Type
U3100
Removable Li-Ion 1000 mAh battery
Watch Buds 2
Li-Ion 410 mAh
Stand-by
U3100
Up to 400 h
Watch Buds 2
-
Talk time
U3100
Up to 4 h 20 min
Watch Buds 2
-
Charging
U3100
-
Watch Buds 2
Wireless
Colors
U3100
Black
Watch Buds 2
Black, Silver
Models
U3100
-
Watch Buds 2
LBA-B19
Price
U3100
-
Watch Buds 2
About 440 EUR
OS
U3100
-
Watch Buds 2
HarmonyOS
Other
U3100
-
Watch Buds 2
No