Screen size
U8100Winner: 2.8"+46%
Watch Buds 21.5"
Quick verdict
U8100 leads the measured specs 7-6.
Measured wins
U8100
7
spec wins
Overall winner
Ties
1
equal specs
Watch Buds 2
6
spec wins
Screen size
Technology
U8100
GSM / HSPA
Watch Buds 2
No cellular connectivity
2G bands
U8100
GSM 900 / 1800 / 1900
Watch Buds 2
N/A
3G bands
U8100
HSDPA 900 / 2100
Watch Buds 2
N/A
Speed
U8100
HSPA 7.2/0.384 Mbps
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
U8100
-
Watch Buds 2
N/A
GPRS
U8100
-
Watch Buds 2
No
EDGE
U8100
-
Watch Buds 2
No
Announced
U8100
2010, February. Released 2010, July
Watch Buds 2
2026, April 20
Status
U8100
Discontinued
Watch Buds 2
Available. Released 2026, April 20
Dimensions
U8100
107.5 x 57 x 13.8 mm (4.23 x 2.24 x 0.54 in)
Watch Buds 2
47 x 47 x 14.7 mm (1.85 x 1.85 x 0.58 in)
Weight
U8100
104 g (3.67 oz)
Watch Buds 2
54.5 g (1.90 oz)
SIM
U8100
Mini-SIM
Watch Buds 2
No
Build
U8100
-
Watch Buds 2
Titanium alloy frame, glass-fiber reinforced plastic back
Other
U8100
-
Watch Buds 2
Built-in wireless earbuds housed beneath the display; charging from the watch Compatible with standard 22mm straps
Type
U8100
TFT, 256K colors
Watch Buds 2
LTPO AMOLED, 3000 nits (peak)
Size
U8100
2.8 inches, 24.3 cm2 (~39.6% screen-to-body ratio)
Watch Buds 2
1.5 inches
Resolution
U8100
240 x 320 pixels, 4:3 ratio (~143 ppi density)
Watch Buds 2
466 x 466 pixels (~310 ppi density)
Other
U8100
Watch Buds 2
-
OS
U8100
Android 2.1 (Eclair)
Watch Buds 2
HarmonyOS
Card slot
U8100
microSDHC (dedicated slot)
Watch Buds 2
No
Single
U8100
3.15 MP
Watch Buds 2
-
Features
U8100
LED flash
Watch Buds 2
-
Video
U8100
Yes
Watch Buds 2
-
Single
U8100
VGA
Watch Buds 2
-
Video
U8100
Watch Buds 2
-
Loudspeaker
U8100
Yes
Watch Buds 2
No
3.5mm jack
U8100
Yes
Watch Buds 2
No
WLAN
U8100
Wi-Fi 802.11 b/g
Watch Buds 2
No
Bluetooth
U8100
2.0, A2DP
Watch Buds 2
5.2, A2DP, LE
Positioning
U8100
GPS, A-GPS
Watch Buds 2
GPS, GLONASS, GALILEO, BDS
Radio
U8100
FM radio
Watch Buds 2
No
USB
U8100
microUSB 2.0
Watch Buds 2
No
NFC
U8100
-
Watch Buds 2
Yes
Sensors
U8100
Accelerometer
Watch Buds 2
Accelerometer, gyro, heart rate, SpO2
Browser
U8100
HTML
Watch Buds 2
-
Other
U8100
MP3/WAV/WMA/eAAC+ player MP4/WMV/H.264 player Document viewer Voice memo Predictive text input
Watch Buds 2
-
Type
U8100
Removable Li-Ion 1150 mAh battery
Watch Buds 2
Li-Ion 410 mAh
Stand-by
U8100
Up to 240 h
Watch Buds 2
-
Talk time
U8100
Up to 4 h 30 min
Watch Buds 2
-
Charging
U8100
-
Watch Buds 2
Wireless
Colors
U8100
Pink
Watch Buds 2
Black, Silver
SAR
U8100
0.76 W/kg (head) 0.86 W/kg (body)
Watch Buds 2
-
SAR EU
U8100
0.68 W/kg (head)
Watch Buds 2
-
Price
U8100
About 70 EUR
Watch Buds 2
About 440 EUR
Models
U8100
-
Watch Buds 2
LBA-B19
Other
U8100
-
Watch Buds 2
No