This is the first Smartwatch that was released by Apple. It has built-in Bluetooth to connect to your iPhone. It also connects to the internet and has a built-in accelerometer to track your speed, a gyroscope for direction, and ambient light sensor so you see the watch at any time of the day.
Second Hand Apple Watch Series 1
If you love exercising and tracking how you are doing, then the used Apple Watch Series 1 is the perfect smartwatch for you. It has great heart rate-tracking functions and an improved Music app that now syncs albums and playlists in Apple Music more easily to help you work out to the right music.