Brand Pebble
Model Watch Steel 401S / 401SS
Released 2014 Jan 28
Hardware Designer Pebble Technology
Manufacturer Foxlink
OEM ID PEBBLE-WATCH2
Device Category 

Smartwatch

Width 34.1 mm
Height 46 mm
Depth 10.3 mm
Dimensions 1.34×1.81×0.41 inches
Mass 99 g
3.49 ounces
Platform 

Yes

Operating System

Real Time Engineers FreeRTOS

CPU

STMicroelectronics STM32F205RE, 2009, 32 bit, single-core

RAM Type 

SRAM

RAM Capacity (converted) 128 KiB RAM
0.03 MiB user accessible RAM
Non-volatile Memory Capacity (converted) 512 KiB ROM
Secondary Non-volatile Memory Capacity 8 MiB sec. ROM
Display Diagonal 32 mm
1.3 inch
Resolution 144×168
Horizontal Full Bezel Width 13.27 mm
Display Area Utilization 32.3%
Pixel Density 176 PPI
Display Type 

mono E Ink display

Number of Display Scales 4
Scratch Resistant Screen 

Gorilla Glass

Graphical Controller N/A
A/V Out  No
Microphone(s)  No
Loudpeaker(s):   No
Audio Output:   No
Supported Cellular Bands  No
Complementary Phone Services 

Vibrate

Sec. Supported Cellular Networks:   No
Expansion Interfaces  No
USB  No
No
USB Connector  No
Bluetooth 

Bluetooth 4.0

Wireless LAN  No
FM Radio Receiver  No
Camera Image Sensor  No
Focus  No
Flash  No
Aux. Camera Image Sensor  No
Aux. 2 Camera Image Sensor  No
Aux. 3 Camera Image Sensor  No
Aux.4 Camera Image Sensor  No
Secondary Camera Sensor  No
Sec. Aux. Cam. Image Sensor  No
Built-in compass 

3D compass

Built-in accelerometer 

3D accelerometer

Additional sensors 

Light sensor

Protection from solid materials 

Non-standard protection

Protection from liquids 

Non-standard protection

Immersion into liquids (depth limit) 5000 cm
Battery 

Li-ion polymer (LiPo)

built-in

1-cell
Nominal Battery Capacity 130 mAh battery
Data Integrity 

Final