Samsung SyncMaster 403Tn Owner's Manual page 13

15. AV IN [R-AUDIO-L](Monitor Audio Connection Terminal (Input))
The number of monitor that can be connected to loopout may be different under
the circumstance such as cable, signal source, etc.
With a cable which there is no degradation or signal source ten monitors can be
connected.
16. DIGITAL AUDIO OUT (Digital Audio Connection Terminal)
17. USB (USB Connection Terminal)
(Keyboard / Mouse, Mass Storage Device Compatible.)
18. LAN (LAN Connection Terminal)
(MS Internet Explorer)
19. EXT SPEAKER(8 Ω) (EXT Speaker Connection Terminal)
See Connecting the Monitor
Remote Control
The performance of the remote control may be affected by a TV or other electronic device operated near
the monitor, causing malfunction due to interference with frequency.
20. Kensington Lock
for further information regarding cable connections.