... 3. Number buttons keyboard 4. RS485, RS232, Multi-protocol 5. OEM Key features:1) Portable design; ... channel video input, 1-channel video output4) Support internet test function, can test and distinguish the ... good or not5) 1W loudspeaker inside, Support audio input6) Support DC12V output, offer electricity for camera7) ... it doesn’t need to set by manual9) Support protocol PELCO-P,PELCO-D, KALATEL etc10) ...