Screen size
U8520 DuplexWinner: 3.2"+43%
Watch Fit 41.8"
Quick verdict
Watch Fit 4 leads the measured specs 8-6.
Measured wins
U8520 Duplex
6
spec wins
Ties
1
equal specs
Watch Fit 4
8
spec wins
Overall winner
Screen size
Technology
U8520 Duplex
GSM / HSPA
Watch Fit 4
No cellular connectivity
2G bands
U8520 Duplex
GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2
Watch Fit 4
N/A
3G bands
U8520 Duplex
HSDPA 900 / 2100 - SIM 1 only, HSDPA 850 / 1900
Watch Fit 4
N/A
Speed
U8520 Duplex
HSPA 7.2/0.384 Mbps
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
Watch Fit 4
No
4G bands
U8520 Duplex
-
Watch Fit 4
N/A
GPRS
U8520 Duplex
-
Watch Fit 4
No
EDGE
U8520 Duplex
-
Watch Fit 4
No
Announced
U8520 Duplex
2011, October. Released 2011, October
Watch Fit 4
2025, May 15
Status
U8520 Duplex
Discontinued
Watch Fit 4
Available. Released 2025, May 26
Dimensions
U8520 Duplex
112 x 57 x 12.7 mm (4.41 x 2.24 x 0.5 in)
Watch Fit 4
43 x 38 x 9.5 mm (1.69 x 1.50 x 0.37 in)
Weight
U8520 Duplex
109 g (3.84 oz)
Watch Fit 4
27 g (0.95 oz)
SIM
U8520 Duplex
Dual SIM (Mini-SIM, dual stand-by)
Watch Fit 4
No
Build
U8520 Duplex
-
Watch Fit 4
Glass front, aluminum alloy frame, plastic back
Other
U8520 Duplex
-
Watch Fit 4
5 ATM water resistant
Type
U8520 Duplex
TFT, 256K colors
Watch Fit 4
AMOLED, 2000 nits (peak)
Size
U8520 Duplex
3.2 inches, 30.5 cm2 (~47.8% screen-to-body ratio)
Watch Fit 4
1.82 inches
Resolution
U8520 Duplex
320 x 480 pixels, 3:2 ratio (~180 ppi density)
Watch Fit 4
480 x 408 pixels (~347 ppi density)
OS
U8520 Duplex
Android 2.2 (Froyo)
Watch Fit 4
-
Chipset
U8520 Duplex
Qualcomm MSM7227-1 Snapdragon S1
Watch Fit 4
-
CPU
U8520 Duplex
600 MHz ARM 11
Watch Fit 4
-
GPU
U8520 Duplex
Adreno 200
Watch Fit 4
-
Card slot
U8520 Duplex
microSDHC (dedicated slot), 2 GB included
Watch Fit 4
No
Internal
U8520 Duplex
512MB 256MB RAM
Watch Fit 4
Unspecified
Phonebook
U8520 Duplex
-
Watch Fit 4
No
Call records
U8520 Duplex
-
Watch Fit 4
No
Single
U8520 Duplex
3.15 MP
Watch Fit 4
-
Video
U8520 Duplex
480p
Watch Fit 4
-
Single
U8520 Duplex
VGA
Watch Fit 4
-
Video
U8520 Duplex
Watch Fit 4
-
Loudspeaker
U8520 Duplex
Yes
Watch Fit 4
Yes
3.5mm jack
U8520 Duplex
Yes
Watch Fit 4
No
WLAN
U8520 Duplex
Wi-Fi 802.11 b/g/n
Watch Fit 4
No
Bluetooth
U8520 Duplex
2.1, A2DP, EDR
Watch Fit 4
5.2, LE
Positioning
U8520 Duplex
GPS, A-GPS
Watch Fit 4
GPS (L1+L5), GALILEO (E1+E5a), QZSS (L1+L5), BDS (B1l+B1C), GLONASS
Radio
U8520 Duplex
Stereo FM radio
Watch Fit 4
No
USB
U8520 Duplex
microUSB 2.0
Watch Fit 4
No
NFC
U8520 Duplex
-
Watch Fit 4
Yes (gray model only)
Sensors
U8520 Duplex
Accelerometer, proximity, compass
Watch Fit 4
Accelerometer, gyro, heart rate, SpO2, compass, barometer
Other
U8520 Duplex
MP3/WAV/eAAC+ player MP4/H.264 player Organizer Document viewer Photo viewer/editor Voice memo/dial Predictive text input
Watch Fit 4
Pulse wave arrhythmia analysis
Messaging
U8520 Duplex
-
Watch Fit 4
Email, IM
Games
U8520 Duplex
-
Watch Fit 4
No
Java
U8520 Duplex
-
Watch Fit 4
No
Type
U8520 Duplex
Removable Li-Ion 1500 mAh battery
Watch Fit 4
Li-Ion 400 mAh
Stand-by
U8520 Duplex
Up to 120 h (2G) / Up to 120 h (3G)
Watch Fit 4
-
Talk time
U8520 Duplex
Up to 7 h (2G) / Up to 7 h 30 min (3G)
Watch Fit 4
-
Music play
U8520 Duplex
Up to 20 h
Watch Fit 4
-
Charging
U8520 Duplex
-
Watch Fit 4
5W wireless
Colors
U8520 Duplex
Black
Watch Fit 4
Black, Silver
Price
U8520 Duplex
About 110 EUR
Watch Fit 4
$ 121.00 / € 104.76
Models
U8520 Duplex
-
Watch Fit 4
SYA-B19
Other
U8520 Duplex
-
Watch Fit 4
No