Setup: 1. Charge Your Watch: Connect the charging cable to your Forerunner 55 and a USB power source. Allow it to charge fully before first use. 2. Download Garmin Connect App: Install the Garmin Connect app on your smartphone (available on iOS App Store and Android Google Play Store). 3. Pair Your Watch: Open the Garmin Connect app, create an account or log in, then follow the on-screen instructions to add your new device. This involves putting your watch into pairing mode and confirming a code on both devices. Compatibility: The Garmin Forerunner 55 is compatible with smartphones running iOS (Apple) and Android. It connects via Bluetooth Low Energy (BLE) to the Garmin Connect mobile app for data syncing, notifications, and device settings. Care: - Cleaning: Regularly wipe your watch with a damp, soft, lint-free cloth. For sweat or dirt, use a mild soap solution and rinse thoroughly. Ensure the charging port is dry before charging. - Water Resistance: The Forerunner 55 is typically rated for 5 ATM (50 meters), meaning it's suitable for splashes, rain or snow, showering, swimming, and diving into water. Avoid pressing buttons underwater. - Storage: Store the watch in a cool, dry place when not in use. - Charging: Use only the supplied Garmin charging cable. Avoid exposing the charging contacts to harsh chemicals or extreme temperatures.