Screen size
U8520 DuplexWinner: 3.2"+57%
Watch Ultimate Design Spring1.4"
Quick verdict
Watch Ultimate Design Spring leads the measured specs 9-6.
Measured wins
U8520 Duplex
6
spec wins
Ties
1
equal specs
Watch Ultimate Design Spring
9
spec wins
Overall winner
Screen size
Technology
U8520 Duplex
GSM / HSPA
Watch Ultimate Design Spring
HSPA / LTE
2G bands
U8520 Duplex
GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2
Watch Ultimate Design Spring
N/A
3G bands
U8520 Duplex
HSDPA 900 / 2100 - SIM 1 only, HSDPA 850 / 1900
Watch Ultimate Design Spring
HSDPA 850 / 900 / 1900 / 2100
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 Ultimate Design Spring
HSPA, LTE
4G bands
U8520 Duplex
-
Watch Ultimate Design Spring
LTE
Announced
U8520 Duplex
2011, October. Released 2011, October
Watch Ultimate Design Spring
2026, April 20
Status
U8520 Duplex
Discontinued
Watch Ultimate Design Spring
Available. Released 2026, May 08
Dimensions
U8520 Duplex
112 x 57 x 12.7 mm (4.41 x 2.24 x 0.5 in)
Watch Ultimate Design Spring
42.9 x 42.9 x 10.8 mm (1.69 x 1.69 x 0.43 in)
Weight
U8520 Duplex
109 g (3.84 oz)
Watch Ultimate Design Spring
91 g (3.21 oz)
SIM
U8520 Duplex
Dual SIM (Mini-SIM, dual stand-by)
Watch Ultimate Design Spring
eSIM
Build
U8520 Duplex
-
Watch Ultimate Design Spring
Sapphire crystal front, titanium alloy front shell, ceramic back
Other
U8520 Duplex
-
Watch Ultimate Design Spring
99 natural diamonds (0.8 carats) 5 ATM (maximum depth 40 meters when diving) IP68/IP69 dust tight and water resistant (high pressure water jets; immersible up to 1.5m for 30 min) ECG certified
Type
U8520 Duplex
TFT, 256K colors
Watch Ultimate Design Spring
LTPO2 AMOLED, 3000 nits (peak)
Size
U8520 Duplex
3.2 inches, 30.5 cm2 (~47.8% screen-to-body ratio)
Watch Ultimate Design Spring
1.38 inches
Resolution
U8520 Duplex
320 x 480 pixels, 3:2 ratio (~180 ppi density)
Watch Ultimate Design Spring
466 x 466 pixels (~338 ppi density)
Protection
U8520 Duplex
-
Watch Ultimate Design Spring
Sapphire crystal glass
OS
U8520 Duplex
Android 2.2 (Froyo)
Watch Ultimate Design Spring
HarmonyOS 6.1
Chipset
U8520 Duplex
Qualcomm MSM7227-1 Snapdragon S1
Watch Ultimate Design Spring
Kirin W80
CPU
U8520 Duplex
600 MHz ARM 11
Watch Ultimate Design Spring
-
GPU
U8520 Duplex
Adreno 200
Watch Ultimate Design Spring
-
Card slot
U8520 Duplex
microSDHC (dedicated slot), 2 GB included
Watch Ultimate Design Spring
No
Internal
U8520 Duplex
512MB 256MB RAM
Watch Ultimate Design Spring
-
Single
U8520 Duplex
3.15 MP
Watch Ultimate Design Spring
-
Video
U8520 Duplex
480p
Watch Ultimate Design Spring
-
Single
U8520 Duplex
VGA
Watch Ultimate Design Spring
-
Video
U8520 Duplex
Watch Ultimate Design Spring
-
Loudspeaker
U8520 Duplex
Yes
Watch Ultimate Design Spring
Yes
3.5mm jack
U8520 Duplex
Yes
Watch Ultimate Design Spring
No
WLAN
U8520 Duplex
Wi-Fi 802.11 b/g/n
Watch Ultimate Design Spring
Wi-Fi 802.11 a/b/g/n/ac/6, dual-band
Bluetooth
U8520 Duplex
2.1, A2DP, EDR
Watch Ultimate Design Spring
5.2, A2DP, LE
Positioning
U8520 Duplex
GPS, A-GPS
Watch Ultimate Design Spring
GPS (L1+L5), GLONASS, GALILEO (L1+L5), QZSS (L1+L5), BDS
Radio
U8520 Duplex
Stereo FM radio
Watch Ultimate Design Spring
No
USB
U8520 Duplex
microUSB 2.0
Watch Ultimate Design Spring
No
NFC
U8520 Duplex
-
Watch Ultimate Design Spring
Yes
Sensors
U8520 Duplex
Accelerometer, proximity, compass
Watch Ultimate Design Spring
Accelerometer, gyro, heart rate, barometer, compass, SpO2, thermometer (body temperature), X-TAP
Other
U8520 Duplex
MP3/WAV/eAAC+ player MP4/H.264 player Organizer Document viewer Photo viewer/editor Voice memo/dial Predictive text input
Watch Ultimate Design Spring
Sleep apnea detection Heart Rate Variability (HRV) Arterial Stiffness Detection
Type
U8520 Duplex
Removable Li-Ion 1500 mAh battery
Watch Ultimate Design Spring
Li-Ion 540 mAh
Stand-by
U8520 Duplex
Up to 120 h (2G) / Up to 120 h (3G)
Watch Ultimate Design Spring
-
Talk time
U8520 Duplex
Up to 7 h (2G) / Up to 7 h 30 min (3G)
Watch Ultimate Design Spring
-
Music play
U8520 Duplex
Up to 20 h
Watch Ultimate Design Spring
-
Charging
U8520 Duplex
-
Watch Ultimate Design Spring
Wireless
Colors
U8520 Duplex
Black
Watch Ultimate Design Spring
Diamond Silver
Price
U8520 Duplex
About 110 EUR
Watch Ultimate Design Spring
About 4000 EUR
Models
U8520 Duplex
-
Watch Ultimate Design Spring
CHC-AL00
Other
U8520 Duplex
-
Watch Ultimate Design Spring
No