KT&C KVR-0412H - Manual (Page 178)

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10.4.7 PTZ control
 Users are able to control PTZ with Android Phone.
 Press volume up button on the right side of the phone to zoom in.
 Press volume down button on the right side of the phone to zoom out.
 Touch sides and corners of the screen to change the direction as user want.
 Touch right side of the screen to move right and left side to move left.
 Touch up side of the screen to move up and down side to move down.
 In the same way, touch any corners to change the directions.
10.4.8 Information
 Click “ ” to get more information, containing how to setup and use the application.