ViewEra V180 Series - Manual (Page 19)

TV Function Selection Menu：
CH Searching： TV channel auto searching and auto save channels
CH EDIT：Add or delete the channel by pressing ＋/ －.
CH Fine tune： Adjust the TV signal reception to get better image quality by pressing ＋/ －.
AIR -Cable：Select the TV signal input by air (TV) or cable (CATV) by pressing ＋/ －.
Page 17