4 In 1 Out BNC Coax Composite Video Switch
This 4-port BNC video switch allows you to simultaneously connect multiple analog BNC video devices together into this switcher and output to video monitor or DVR through BNC cable hookup  without disconnecting and reconnecting the cables. 

This BNC video switch comes with easy rotary dial for switching between multiple coaxial video or composite type video signal inputs from devices such as CCTV surveillance cameras, media players, DVRs, satellite receivers, CATV set top boxes and other video devices with BNC or coaxial composite video connectors.

Also beneficial for reducing the wear and tear on the input connector of your video monitor caused by daily operations when constantly plugging and unplugging the coaxial and BNC cables.

Fast Input Switching
Fast and smooth switching between video inputs with real time output with no lags.

Users can select either one of the 4 BNC video sources connected for output display by simply turning the dial on the front panel so the desired source input signal can be routed to a connected CCTV monitor, TV, plasma screen, video projector etc.

This product is normally used to switch coaxial-type connections such as video or network cables. 

It is a passive switch so no external power supply needed.