The Fitbit Charge 4 is a fitness tracker designed to help you stay active and reach your goals. It features an all-day heart rate monitor, sleep tracking, and up to seven days of battery life. It also has built-in GPS, so you can track your runs
From Wikipedia
Fitbit, sometimes marketed as Google Fitbit, is a line of wireless-enabled wearable technology, physical fitness monitors and activity trackers such as smartwatches, pedometers and monitors for heart rate, quality of sleep, and stairs climbed as well as related software. It operated as an American consumer electronics and fitness company from 2007 to 2021.