https://techcrunch.com/2019/06/12/xiaomi-mi-smart-band-4-gadgets/

Xiaomi has refreshed its smart fitness tracker and unveiled a range of other gadgets in China, giving a glimpse at some of its affordable products that it will likely be bringing to other markets in the coming future.

The wearable fitness tracker, called Mi Smart Band 4, sports a bigger AMOLED display (39.9% increase in screen size) than its popular year-old predecessor and features support for XiaoAI, the company’s voice assistant that can be activated with a voice command.