![background image](http://html.mh-extra.com/html/samsung/sch-i640/sch-i640_user-manual_1189881009.webp)
Earphone jack: Connects the optional 2.5mm ear/microphone.
External screen: A secondary screen for phone features.
IR port: Uses infrared technology to transmit data to and receive data from other
computing platform handhelds, and to perform ActiveSync® operations.
Accessory connector: Connects your phone to the cradle, which in turn connects to
the back of your computer and through the AC adapter to the wall current.
SD slot: Inserts SD card for extended memory, and connects peripherals using SD I/O
interface.
Volume keys: Press to adjust voice volume during conversation, and adjust audio
volume in standby mode.
Record button: Press to launch Voice Notes, and press one more time to record the
voice memo. Press and hold to activate voice recognition command.
Quick List key: Press to launch the Quick List and press and hold to turn phone (radio
module) on/off.
Camera key (Side): Press and hold to launch the camera application, and press one
more time to take a picture or record a video (645 only).
9