Bixby Button: Launches the Bixby virtual assistant.
Camera: Used for taking pictures.
Fingerprint Sensor: Used for unlocking the device with your fingerprint.
Flash: Used for taking pictures in low-light situations.
Heart Rate Sensor: Used for detecting heart rate and other vital signs in Samsung Health.
Microphone: Built-in microphone used for phone calls and voice commands.
Power/Lock Button: Press to lock or unlock the touchscreen. Hold down to turn the device on or off.
Speaker: Used to play sounds on your device.
Volume Buttons: Adjust the volume on your device.