The Fitbit Charge 4 is a versatile fitness tracker that offers a range of features designed to help you monitor and improve your health. With built-in GPS, heart rate monitoring, sleep tracking, and swim tracking, it's a comprehensive tool for fitness enthusiasts.

One of the standout features is the built-in GPS, which allows you to track your pace and distance during outdoor activities like running, cycling, and hiking. The Active Zone Minutes feature buzzes when you reach your target heart rate zones, providing real-time feedback on your workout intensity.

Users have praised the sleep tracking functionality, which provides detailed insights into sleep stages and offers a Sleep Score to help you understand the quality of your rest. The customizable alarms that wake you up from light sleep are also a hit, making mornings less groggy.

However, some users have reported issues with the GPS connectivity, which can be inconsistent. This can be frustrating for those who rely on accurate route and distance tracking for their workouts. Additionally, while the stock band is functional, many users recommend replacing it with a more comfortable third-party option.

Battery life is generally good, lasting up to 7 days on a single charge, though using the GPS can significantly reduce this. The device is also swimproof and water-resistant up to 50 meters, making it suitable for swimming and showering.

Overall, the Fitbit Charge 4 is a solid choice for those looking to track their fitness and health metrics comprehensively. While it has some minor drawbacks like GPS connectivity issues and an average stock band, its robust feature set makes it a worthwhile investment for most users.