Camera: Used for taking pictures.
Flash: Used for taking pictures in low-light situations.
Microphone: Built-in microphone used for phone calls and voice commands.
Nano SIM / microSD card slot: Insert or remove your nano SIM / microSD card here.
Power/lock button and Fingerprint sensor: Press to lock or unlock the touchscreen. Hold down to turn the device on or off. Used for unlocking the device with your fingerprint.
Speaker: Used to play sounds on your device.
USB/charging Port: Connects your phone to the battery charger or to another device for transferring data.
Volume buttons: Adjusts the volume on your device.