VDWALL LVP615S LED Screen Video Processor supports hot spare of input signals. When the current input signal is lost. VDWALL LVP615S will switch to the spare signal automatically to avoid image interruption caused by the fault of signal source. Apart from main sale of LED screens, we also deal in selling parts of LED screens which come directly from the factories. Sale of LED screen parts is our major work and we will do that to satisfy your need.