Screen size
U121Winner: 1.8"+17%
Watch Buds 21.5"
Quick verdict
Watch Buds 2 leads the measured specs 7-6.
Measured wins
U121
6
spec wins
Ties
1
equal specs
Watch Buds 2
7
spec wins
Overall winner
Screen size
Technology
U121
GSM / UMTS
Watch Buds 2
No cellular connectivity
2G bands
U121
GSM 900 / 1800 / 1900
Watch Buds 2
N/A
3G bands
U121
UMTS 2100
Watch Buds 2
N/A
Speed
U121
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
SD card
Stereo speakers
No
4G bands
U121
-
Watch Buds 2
N/A
GPRS
U121
-
Watch Buds 2
No
EDGE
U121
-
Watch Buds 2
No
Announced
U121
2007, Q2
Watch Buds 2
2026, April 20
Status
U121
Discontinued
Watch Buds 2
Available. Released 2026, April 20
Dimensions
U121
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
U121
90 g (3.17 oz)
Watch Buds 2
54.5 g (1.90 oz)
SIM
U121
Mini-SIM
Watch Buds 2
No
Build
U121
-
Watch Buds 2
Titanium alloy frame, glass-fiber reinforced plastic back
Other
U121
-
Watch Buds 2
Built-in wireless earbuds housed beneath the display; charging from the watch Compatible with standard 22mm straps
Type
U121
TFT, 256K colors
Watch Buds 2
LTPO AMOLED, 3000 nits (peak)
Size
U121
1.8 inches, 10.2 cm2 (~22.0% screen-to-body ratio)
Watch Buds 2
1.5 inches
Resolution
U121
176 x 220 pixels (~157 ppi density)
Watch Buds 2
466 x 466 pixels (~310 ppi density)
Card slot
U121
microSD (dedicated slot)
Watch Buds 2
No
Phonebook
U121
1000 entries
Watch Buds 2
-
Call records
U121
20 dialed, 20 received, 20 missed calls
Watch Buds 2
-
Single
U121
1.3 MP
Watch Buds 2
-
Video
U121
Yes
Watch Buds 2
-
Single
U121
VGA videocall camera
Watch Buds 2
-
Video
U121
Watch Buds 2
-
Loudspeaker
U121
Yes
Watch Buds 2
No
3.5mm jack
U121
Yes
Watch Buds 2
No
WLAN
U121
No
Watch Buds 2
No
Bluetooth
U121
1.1
Watch Buds 2
5.2, A2DP, LE
Positioning
U121
No
Watch Buds 2
GPS, GLONASS, GALILEO, BDS
Radio
U121
FM radio
Watch Buds 2
No
USB
U121
2.0
Watch Buds 2
No
NFC
U121
-
Watch Buds 2
Yes
Sensors
U121
Watch Buds 2
Accelerometer, gyro, heart rate, SpO2
Messaging
U121
SMS, MMS, Email
Watch Buds 2
-
Browser
U121
WAP 2.0/xHTML, RSS read
Watch Buds 2
-
Games
U121
Yes
Watch Buds 2
-
Java
U121
No
Watch Buds 2
-
Other
U121
MP3/MP4/AAC/3GP player Predictive text input Organizer Photo editor MS Word viewer Video streaming
Watch Buds 2
-
Type
U121
Removable Li-Ion battery
Watch Buds 2
Li-Ion 410 mAh
Stand-by
U121
Up to 300 h
Watch Buds 2
-
Charging
U121
-
Watch Buds 2
Wireless
Colors
U121
Grey
Watch Buds 2
Black, Silver
Models
U121
-
Watch Buds 2
LBA-B19
Price
U121
-
Watch Buds 2
About 440 EUR
OS
U121
-
Watch Buds 2
HarmonyOS
Other
U121
-
Watch Buds 2
No