SoundMax SM-LCD915 - Manual (Page 7)

7
Car backing signal connection
Using the control wire included, connect the AV switch control socket to car
backing. When backing, the unit will automatically switch to AV mode; so, if a
rear view camera is connected to the unit, the display will show the picture of
behind the vehicle.
USB connection
Connect the included MiniUSB-USB cable to the USB slot of the unit. Then
connect a USB to the other end of the cable. The display will show a menu of
contents, from which you can select files for playback. To disconnect the USB,
just pull it out from the cable.
Memory card connection
Insert an SD/MMC memory card into the slot in the bottom of the unit
(observe the correct direction). The display will show a menu of contents,
from which you can select files for playback. To disconnect the memory card,
just pull it out from the slot.