- 1 channel complex video output/input,1 channel av signal output/input - image freezing function： - whole image freezing. - 1/2 image freezing(up-and-down) - 1/2 image freezing （left-and-right） - 1/4 image freezing - osd manu prompt function .led estate prompt - after image freezing any image can be blowup for seeing in any mode lenkeng lkv820 image freezing board connection diagram is for managing image. have osd / led prompt function. be the same with iatrical equipment etc professional realm ways: 1/4 image freezing. 1/2 image freezing. all image freezing. choics image can be blowup for seeing lkv820 main application field of lkv820 image freezing board is iatrical equipment etc professional realm.function can be changed based on client's need