Audiovox D2017PK Instruction Manual page 13

4. ZOOM
During playback press 'ZOOM' mutiple times to enlarge the picture
by 2X, 3X or 4X.
.
5. A-B REPEAT
a. During playback press the 'A-B' button once to set the Starting
Point A.
b. Press 'A-B' a second time to set the Ending Point B and the
player will repeatedly play the part between Point A and Point B.
c. Press A-B a third time to cancel A-B repeat and resume
normal playback.
A-B Repeat Starting Point
Zoom
A-B Repeat Ending Point
13
A-B Repeat Cancelled