Screen size
Galaxy Watch Ultra21.5"
J400Winner: 2.0"+25%
Quick verdict
Galaxy Watch Ultra2 leads the measured specs 11-7.
Measured wins
Galaxy Watch Ultra2
11
spec wins
Overall winner
Ties
2
equal specs
J400
7
spec wins
Screen size
Technology
Galaxy Watch Ultra2
GSM / HSPA / LTE
J400
GSM / UMTS
2G bands
Galaxy Watch Ultra2
GSM 850 / 900 / 1800 / 1900
J400
GSM 900 / 1800 / 1900
3G bands
Galaxy Watch Ultra2
HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100
J400
UMTS 2100
4G bands
Galaxy Watch Ultra2
LTE
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
equal specsSD card
Stereo speakers
J400
-
Speed
Galaxy Watch Ultra2
HSPA, LTE
J400
Yes, 384 kbps
Announced
Galaxy Watch Ultra2
Not announced yet
J400
2008, January. Released 2008, October
Status
Galaxy Watch Ultra2
Rumored
J400
Discontinued
Dimensions
Galaxy Watch Ultra2
-
J400
99 x 49.5 x 15.9 mm (3.90 x 1.95 x 0.63 in)
Weight
Galaxy Watch Ultra2
-
J400
101.2 g (3.56 oz)
Build
Galaxy Watch Ultra2
Sapphire crystal front, ceramic/sapphire crystal back, titanium frame (grade 4)
J400
-
SIM
Galaxy Watch Ultra2
eSIM
J400
Mini-SIM
Other
Galaxy Watch Ultra2
IP68 dust tight and water resistant (immersible up to 100m/10ATM for 10 min) MIL-STD-810H compliant ECG certified
J400
-
Type
Galaxy Watch Ultra2
Super AMOLED, 5000 nits (peak)
J400
TFT, 256K colors
Size
Galaxy Watch Ultra2
1.5 inches
J400
2.0 inches, 12.6 cm2 (~25.7% screen-to-body ratio)
Resolution
Galaxy Watch Ultra2
480 x 480 pixels (~327 ppi density)
J400
176 x 220 pixels (~141 ppi density)
Protection
Galaxy Watch Ultra2
Sapphire crystal glass
J400
-
Other
Galaxy Watch Ultra2
-
J400
Second external, monochrome display (96 x 96 pixels)
OS
Galaxy Watch Ultra2
Android Wear OS 6, One UI Watch 9
J400
-
Chipset
Galaxy Watch Ultra2
Snapdragon SW6100 Wear Elite (3 nm)
J400
-
CPU
Galaxy Watch Ultra2
Penta-core (1x2.1 GHz & 4x 1.95 GHz)
J400
-
Card slot
Galaxy Watch Ultra2
No
J400
microSD (dedicated slot)
Internal
Galaxy Watch Ultra2
32GB 2GB RAM, 64GB 2GB RAM
J400
8MB
Phonebook
Galaxy Watch Ultra2
-
J400
1000 entries, Photocall
Call records
Galaxy Watch Ultra2
-
J400
20 dialed, 20 received, 20 missed calls
Other
Galaxy Watch Ultra2
No
J400
-
Loudspeaker
Galaxy Watch Ultra2
Yes
J400
No
3.5mm jack
Galaxy Watch Ultra2
No
J400
No
Alert types
Galaxy Watch Ultra2
-
J400
Vibration; Downloadable polyphonic, MP3 ringtones
WLAN
Galaxy Watch Ultra2
Wi-Fi 802.11 a/b/g/n/ac, dual-band
J400
No
Bluetooth
Galaxy Watch Ultra2
6.0, A2DP, LE
J400
2.0
Positioning
Galaxy Watch Ultra2
GPS (L1+L5), GLONASS, GALILEO, BDS
J400
No
NFC
Galaxy Watch Ultra2
Yes
J400
-
Radio
Galaxy Watch Ultra2
No
J400
No
USB
Galaxy Watch Ultra2
No
J400
2.0
Sensors
Galaxy Watch Ultra2
Accelerometer, gyro, heart rate, barometer, altimeter, compass, SpO2, temperature (body), temperature (water), BioActive
J400
Messaging
Galaxy Watch Ultra2
-
J400
SMS, EMS, MMS, Email
Browser
Galaxy Watch Ultra2
-
J400
WAP 2.0/xHTML, HTML (NetFront 3.4)
Games
Galaxy Watch Ultra2
-
J400
Yes
Java
Galaxy Watch Ultra2
-
J400
Yes, MIDP 2.0
Other
Galaxy Watch Ultra2
-
J400
MP3/AAC/AAC+/WMA player MP4/3gp player Organizer Currency converter Voice memo Predictive text input
Type
Galaxy Watch Ultra2
Si/C Li-Ion 800 mAh
J400
Removable Li-Ion 820 mAh battery
Charging
Galaxy Watch Ultra2
10W wireless
J400
-
Stand-by
Galaxy Watch Ultra2
-
J400
Up to 250 h
Talk time
Galaxy Watch Ultra2
-
J400
Up to 3 h
Colors
Galaxy Watch Ultra2
Gray, Green
J400
Black
Models
Galaxy Watch Ultra2
SM-L715F
J400
-
Price
Galaxy Watch Ultra2
About 750 EUR
J400
About 80 EUR
SAR
Galaxy Watch Ultra2
-
J400
0.37 W/kg (head) 0.56 W/kg (body)
SAR EU
Galaxy Watch Ultra2
-
J400
0.19 W/kg (head)
Single
Galaxy Watch Ultra2
-
J400
1.3 MP
Video
Galaxy Watch Ultra2
-
J400
QCIF
Single
Galaxy Watch Ultra2
-
J400
VGA videocall camera
Video
Galaxy Watch Ultra2
-
J400