It is built into the band itself
If you liked the Honor Band 5, the brand unveiled a more affordable version with the Honor Band 5i. While it gets a few downgrades—you only get a TFT display instead of an AMOLED one, and NFC is missing—the Honor Band 5i has a USB-A port housed in the silicone strap, saving you the need for a charging cradle.
Save for those differences, you get the same set of features: SPo2 sensor, heart rate sensor, music controls, remote camera shutter (for EMUI phones), and 50m water resistance.
The Honor Band 5i is priced at CNY 159(~Php 1.2k) and will be available starting November 1.