... /V in and 1 RF out, 8 channel agile modulator. RF Modulator,Features1.8 audio/video input, one RF output from 45-550MHz ... functional circuit of the overall unit adopts SMT technology, with high security.5. LED displays frequency, using up and down button ... . Convenient control, all frequency level adjustments on front panel.7. High efficiency power supply.8. We can make different TV system ...