Based on this product's specifications, here are some alternatives and similar models
Google Fitbit Air Activity Tracker, Obsidian, 7-Day Battery Life
Summary description:
The Google Fitbit Air is a rectangle-shaped wristband activity tracker in Obsidian black. Designed for health monitoring, it integrates with Google Health applications to track daily activity. It features a built-in battery providing up to 7 days of usage on a single charge, with a quick 1.3-hour charging time. Compatible with Android and iOS mobile operating systems, this lightweight tracker is ideal for monitoring fitness metrics and daily wellness goals.