Screen size
U5510Winner: 2.4"+24%
Watch Fit 41.8"
Quick verdict
Watch Fit 4 leads the measured specs 8-7.
Measured wins
U5510
7
spec wins
Ties
1
equal specs
Watch Fit 4
8
spec wins
Overall winner
Screen size
Technology
U5510
GSM / HSPA
Watch Fit 4
No cellular connectivity
2G bands
U5510
GSM 900 / 1800 - SIM 1 & SIM 2
Watch Fit 4
N/A
3G bands
U5510
HSDPA 2100
Watch Fit 4
N/A
Speed
U5510
HSPA 7.2/5.76 Mbps
Watch Fit 4
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 Fit 4
N/A
GPRS
U5510
-
Watch Fit 4
No
EDGE
U5510
-
Watch Fit 4
No
Announced
U5510
2011
Watch Fit 4
2025, May 15
Status
U5510
Discontinued
Watch Fit 4
Available. Released 2025, May 26
Dimensions
U5510
115 x 49.5 x 13.2 mm (4.53 x 1.95 x 0.52 in)
Watch Fit 4
43 x 38 x 9.5 mm (1.69 x 1.50 x 0.37 in)
Weight
U5510
90 g (3.17 oz)
Watch Fit 4
27 g (0.95 oz)
SIM
U5510
Dual SIM (Mini-SIM, dual stand-by)
Watch Fit 4
No
Build
U5510
-
Watch Fit 4
Glass front, aluminum alloy frame, plastic back
Other
U5510
-
Watch Fit 4
5 ATM water resistant
Type
U5510
TFT
Watch Fit 4
AMOLED, 2000 nits (peak)
Size
U5510
2.4 inches, 17.8 cm2 (~31.3% screen-to-body ratio)
Watch Fit 4
1.82 inches
Resolution
U5510
240 x 320 pixels, 4:3 ratio (~167 ppi density)
Watch Fit 4
480 x 408 pixels (~347 ppi density)
CPU
U5510
650 MHz
Watch Fit 4
-
Card slot
U5510
microSDHC (dedicated slot)
Watch Fit 4
No
Phonebook
U5510
Yes, Photocall
Watch Fit 4
No
Call records
U5510
Yes
Watch Fit 4
No
Internal
U5510
40MB 1GB ROM 512MB RAM
Watch Fit 4
Unspecified
Single
U5510
3.15 MP
Watch Fit 4
-
Video
U5510
Yes
Watch Fit 4
-
Single
U5510
VGA
Watch Fit 4
-
Video
U5510
Watch Fit 4
-
Loudspeaker
U5510
Yes
Watch Fit 4
Yes
3.5mm jack
U5510
Yes
Watch Fit 4
No
WLAN
U5510
Wi-Fi 802.11 b/g
Watch Fit 4
No
Bluetooth
U5510
2.1, A2DP, EDR
Watch Fit 4
5.2, LE
Positioning
U5510
No
Watch Fit 4
GPS (L1+L5), GALILEO (E1+E5a), QZSS (L1+L5), BDS (B1l+B1C), GLONASS
Radio
U5510
Stereo FM radio
Watch Fit 4
No
USB
U5510
microUSB 2.0
Watch Fit 4
No
NFC
U5510
-
Watch Fit 4
Yes (gray model only)
Sensors
U5510
Watch Fit 4
Accelerometer, gyro, heart rate, SpO2, compass, barometer
Messaging
U5510
SMS, MMS, Email, IM
Watch Fit 4
Email, IM
Games
U5510
Yes
Watch Fit 4
No
Java
U5510
Yes, MIDP 2.0
Watch Fit 4
No
Other
U5510
SNS applications MP3/eAAC+ player MP4/H.264 Organizer Voice memo Predictive text input
Watch Fit 4
Pulse wave arrhythmia analysis
Type
U5510
Removable Li-Ion 1000 mAh battery
Watch Fit 4
Li-Ion 400 mAh
Stand-by
U5510
Up to 350 h
Watch Fit 4
-
Talk time
U5510
Up to 3 h 20 min
Watch Fit 4
-
Charging
U5510
-
Watch Fit 4
5W wireless
Colors
U5510
Black
Watch Fit 4
Black, Silver
Price
U5510
About 80 EUR
Watch Fit 4
$ 121.00 / € 104.76
Models
U5510
-
Watch Fit 4
SYA-B19
Other
U5510
-
Watch Fit 4
No