Transflective LCD, e-paper or similar always visible low-power display technology is mandatory for infrequently charged compact wearables. I tried I like Amazf

Transflective LCD, e-paper or similar always visible low-power display technology is mandatory for infrequently charged compact wearables. I tried I like Amazfit Bip (older, more contrast, low refresh frequency) and Amazfit Bip S (newer, less contrast, higher refresh frequency, music playback control) devices that work for more than a month on one charge. For Android synchronization one can use excellent FOSS Gadgetbridge app.