Screen size
U5900sWinner: 2.4"+38%
Watch Buds 21.5"
Quick verdict
U5900s leads the measured specs 7-6.
Measured wins
U5900s
7
spec wins
Overall winner
Ties
1
equal specs
Watch Buds 2
6
spec wins
Screen size
Technology
U5900s
GSM / HSPA
Watch Buds 2
No cellular connectivity
2G bands
U5900s
GSM 850 / 900 / 1800 / 1900
Watch Buds 2
N/A
3G bands
U5900s
HSDPA 2100
Watch Buds 2
N/A
Speed
U5900s
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
U5900s
-
Watch Buds 2
N/A
GPRS
U5900s
-
Watch Buds 2
No
EDGE
U5900s
-
Watch Buds 2
No
Announced
U5900s
2011, Q1. Released 2011, May
Watch Buds 2
2026, April 20
Status
U5900s
Discontinued
Watch Buds 2
Available. Released 2026, April 20
Dimensions
U5900s
104.5 x 51.2 x 11.8 mm (4.11 x 2.02 x 0.46 in)
Watch Buds 2
47 x 47 x 14.7 mm (1.85 x 1.85 x 0.58 in)
Weight
U5900s
112 g (3.95 oz)
Watch Buds 2
54.5 g (1.90 oz)
SIM
U5900s
Mini-SIM
Watch Buds 2
No
Build
U5900s
-
Watch Buds 2
Titanium alloy frame, glass-fiber reinforced plastic back
Other
U5900s
-
Watch Buds 2
Built-in wireless earbuds housed beneath the display; charging from the watch Compatible with standard 22mm straps
Type
U5900s
TFT, 256K colors
Watch Buds 2
LTPO AMOLED, 3000 nits (peak)
Size
U5900s
2.4 inches, 17.8 cm2 (~33.3% screen-to-body ratio)
Watch Buds 2
1.5 inches
Resolution
U5900s
240 x 320 pixels, 4:3 ratio (~167 ppi density)
Watch Buds 2
466 x 466 pixels (~310 ppi density)
Card slot
U5900s
microSDHC (dedicated slot)
Watch Buds 2
No
Phonebook
U5900s
Yes, Photocall
Watch Buds 2
-
Call records
U5900s
Yes
Watch Buds 2
-
Internal
U5900s
10MB
Watch Buds 2
-
Single
U5900s
2 MP
Watch Buds 2
-
Video
U5900s
Yes
Watch Buds 2
-
Single
U5900s
VGA videocall camera
Watch Buds 2
-
Video
U5900s
Watch Buds 2
-
Loudspeaker
U5900s
Yes
Watch Buds 2
No
3.5mm jack
U5900s
Yes
Watch Buds 2
No
WLAN
U5900s
No
Watch Buds 2
No
Bluetooth
U5900s
2.0, A2DP
Watch Buds 2
5.2, A2DP, LE
Positioning
U5900s
No
Watch Buds 2
GPS, GLONASS, GALILEO, BDS
Radio
U5900s
FM radio
Watch Buds 2
No
USB
U5900s
miniUSB 2.0
Watch Buds 2
No
NFC
U5900s
-
Watch Buds 2
Yes
Sensors
U5900s
Watch Buds 2
Accelerometer, gyro, heart rate, SpO2
Messaging
U5900s
SMS, MMS, Email
Watch Buds 2
-
Browser
U5900s
WAP 2.0/xHTML, HTML
Watch Buds 2
-
Games
U5900s
Yes
Watch Buds 2
-
Java
U5900s
Yes
Watch Buds 2
-
Other
U5900s
SNS integration MP3/MP4 player Organizer Predictive text input
Watch Buds 2
-
Type
U5900s
Removable Li-Ion 830 mAh battery
Watch Buds 2
Li-Ion 410 mAh
Stand-by
U5900s
Up to 200 h
Watch Buds 2
-
Talk time
U5900s
Up to 4 h
Watch Buds 2
-
Charging
U5900s
-
Watch Buds 2
Wireless
Colors
U5900s
Black
Watch Buds 2
Black, Silver
Price
U5900s
About 80 EUR
Watch Buds 2
About 440 EUR
Models
U5900s
-
Watch Buds 2
LBA-B19
OS
U5900s
-
Watch Buds 2
HarmonyOS
Other
U5900s
-
Watch Buds 2
No