Screen size
U5510Winner: 2.4"+38%
Watch Buds 21.5"
Quick verdict
U5510 leads the measured specs 8-6.
Measured wins
U5510
8
spec wins
Overall winner
Ties
1
equal specs
Watch Buds 2
6
spec wins
Screen size
Technology
U5510
GSM / HSPA
Watch Buds 2
No cellular connectivity
2G bands
U5510
GSM 900 / 1800 - SIM 1 & SIM 2
Watch Buds 2
N/A
3G bands
U5510
HSDPA 2100
Watch Buds 2
N/A
Speed
U5510
HSPA 7.2/5.76 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
SD card
Stereo speakers
No
4G bands
U5510
-
Watch Buds 2
N/A
GPRS
U5510
-
Watch Buds 2
No
EDGE
U5510
-
Watch Buds 2
No
Announced
U5510
2011
Watch Buds 2
2026, April 20
Status
U5510
Discontinued
Watch Buds 2
Available. Released 2026, April 20
Dimensions
U5510
115 x 49.5 x 13.2 mm (4.53 x 1.95 x 0.52 in)
Watch Buds 2
47 x 47 x 14.7 mm (1.85 x 1.85 x 0.58 in)
Weight
U5510
90 g (3.17 oz)
Watch Buds 2
54.5 g (1.90 oz)
SIM
U5510
Dual SIM (Mini-SIM, dual stand-by)
Watch Buds 2
No
Build
U5510
-
Watch Buds 2
Titanium alloy frame, glass-fiber reinforced plastic back
Other
U5510
-
Watch Buds 2
Built-in wireless earbuds housed beneath the display; charging from the watch Compatible with standard 22mm straps
Type
U5510
TFT
Watch Buds 2
LTPO AMOLED, 3000 nits (peak)
Size
U5510
2.4 inches, 17.8 cm2 (~31.3% screen-to-body ratio)
Watch Buds 2
1.5 inches
Resolution
U5510
240 x 320 pixels, 4:3 ratio (~167 ppi density)
Watch Buds 2
466 x 466 pixels (~310 ppi density)
CPU
U5510
650 MHz
Watch Buds 2
-
OS
U5510
-
Watch Buds 2
HarmonyOS
Card slot
U5510
microSDHC (dedicated slot)
Watch Buds 2
No
Phonebook
U5510
Yes, Photocall
Watch Buds 2
-
Call records
U5510
Yes
Watch Buds 2
-
Internal
U5510
40MB 1GB ROM 512MB RAM
Watch Buds 2
-
Single
U5510
3.15 MP
Watch Buds 2
-
Video
U5510
Yes
Watch Buds 2
-
Single
U5510
VGA
Watch Buds 2
-
Video
U5510
Watch Buds 2
-
Loudspeaker
U5510
Yes
Watch Buds 2
No
3.5mm jack
U5510
Yes
Watch Buds 2
No
WLAN
U5510
Wi-Fi 802.11 b/g
Watch Buds 2
No
Bluetooth
U5510
2.1, A2DP, EDR
Watch Buds 2
5.2, A2DP, LE
Positioning
U5510
No
Watch Buds 2
GPS, GLONASS, GALILEO, BDS
Radio
U5510
Stereo FM radio
Watch Buds 2
No
USB
U5510
microUSB 2.0
Watch Buds 2
No
NFC
U5510
-
Watch Buds 2
Yes
Sensors
U5510
Watch Buds 2
Accelerometer, gyro, heart rate, SpO2
Messaging
U5510
SMS, MMS, Email, IM
Watch Buds 2
-
Games
U5510
Yes
Watch Buds 2
-
Java
U5510
Yes, MIDP 2.0
Watch Buds 2
-
Other
U5510
SNS applications MP3/eAAC+ player MP4/H.264 Organizer Voice memo Predictive text input
Watch Buds 2
-
Type
U5510
Removable Li-Ion 1000 mAh battery
Watch Buds 2
Li-Ion 410 mAh
Stand-by
U5510
Up to 350 h
Watch Buds 2
-
Talk time
U5510
Up to 3 h 20 min
Watch Buds 2
-
Charging
U5510
-
Watch Buds 2
Wireless
Colors
U5510
Black
Watch Buds 2
Black, Silver
Price
U5510
About 80 EUR
Watch Buds 2
About 440 EUR
Models
U5510
-
Watch Buds 2
LBA-B19
Other
U5510
-
Watch Buds 2
No