4 Camera Color Multiplexers 
WELDEX WDM-405C 4 Channel Color Duplex Multiplexer WDM-405C

Duplexer Function (Record, Playback) On-Screen Menu and Programming Real Time Quad Display Full, Quad, PIP & POP Display Modes Built-In Time, Date, Title Generator Alarm Input with Built-In Buzzer and Alarm Out Alarm Status Record Alarm Time Zone Selectable Buzzer for Alarm In/Out Freeze Function 4 Channels Full Motion Detection Function Time Lapse VCR Support Programmable Dwell Time (1 ~ 99 seconds) Power On List Record Display Video Loss List Record Display Alarm Event List Record Display Digital 2x Zoom in VCR Play Back Mode Buzzer On/Off Function Border Line On/Off Function Auto Sequential Roll-Free Function Small Size : 200(W) x 43(H) x 170(D)mm