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Feature Classic,
Steel
Time,
Time Steel
Time Round Pebble 2 Time 2
Platform Aplite Basalt Chalk Diorite Emery
CPU Cortex-M3
64 MHz
Cortex-M4
100 MHz
Cortex-M7
144 MHz
Max. resource size 96k 256k 512k
Max. app size (code + heap) 24k 64k 128k
Display shape Rectangle Round Rectangle
Display resolution 144 x 168 180 x 180 144 x 168 200 x 228
Display PPI 175 182 175 202
Supported colors 2 64 2 64
Heart Rate Monitor No Yes
(with smartstrap)
Yes
(except SE model)
Yes
Microphone No Yes
Sensors Accelerometer, Compass Accelerometer Accelerometer, Compass
Buttons 4
Charging port Power only Smart accessory port Smart accessory port (data only) Smart accessory port