Galaxy S4. Back View
5. Microphones are used during phone calls and allow other callers to hear you clearly when you are speaking to them. There are two microphones on the device: • Bottom microphone: used during handset mode. • Top microphone: used while an active call is in the speakerphone mode and assists in noise cancellation (2 microphone solution). 6. USB Power/Accessory connector allows you to connect a power cable or optional accessories such as a USB/ data cable. 7. Back key redisplays the previous screen or clears entries. 8. Display shows all the information needed to operate your phone, such as the connection status, received signal strength, phone battery level, and time. 9. Front Facing Camera allows you to take pictures while facing the screen and allows you to video conference. 10. Gestures Sensor used to detect Air View and Air Gesture motions. 28 11. Proximity Sensor detects how close an object is to the surface of the screen. This is typically used to detect when your face is pressed up against the screen, such as during a phone call. • While talking on the phone, the sensor detects talk activity and locks the keypad to prevent accidental key presses. 12. Receiver allows you to hear the other caller. Back View The following illustration shows the external elements of your Device: 1. microSD Card Slot (internal) allows you use a microSD card to expand the memory of your device. 2. External speaker allows you to hear ringers, music, and other sounds offered by your phone.