I purchased this and used it a few times then wanted something bigger in the Fitbit line. It’s in great shape nothings wrong with it. I changed my original band to wear a color that was matched my uniform for work and then lost the original band ugh! Ordered another and a black one that hasn’t been opened. The band isn’t Fitbit but does work with Fitbit. The instructions are on the box which the watch will come in the original box. Here are the specs about this gem of a device Operating System Android Wear 1.0 Special Feature Activity Tracker, Multisport Tracker, GPS, ECG, Contactless Payments, Sleep Monitor Battery Capacity 0.25 Connectivity Technology Wi-Fi Wireless Communication Standard Bluetooth Battery Cell Composition Lithium Ion Advanced Fitness Tracking: Built-in GPS, heart rate monitoring, 40+ exercise modes, Active Zone Minutes, and automatic exercise tracking provide comprehensive insights into your workouts and activities. Sleek Design with Vibrant Display: The Fitbit Charge 6 features a 1.04-inch AMOLED color touchscreen display, allowing for customizable clock faces and easy access to fitness data. Comprehensive Health Monitoring: ECG and irregular heart rhythm notifications, SpO2 monitoring, resting heart rate tracking, and sleep analysis offer a holistic view of your overall well-being. Long-Lasting Battery and Water Resistance: With up to 7 days of battery life and water resistance up to 50 meters, the Charge 6 is built to withstand your active lifestyle.