I’m a big fan of wearable device. I’ve been wearing fitbit devices like the Fitbit Flex for Quantified Self measurements since 2013, owned several Pebble e-ink watches.
The long battery life of e-ink wearable devices and always on screens have always been important features to me, which have disqualified popular ewatches such as the apple watch and google pixel watch.
The pebble watches were also unique in their kind by offering an interesting accessible development method using the companion app on the phone to run javascript, and using remotely configurable app views on the watch device. This alleviates a lot of low level programming and made it really easy to develop apps for the pebble watch