... , 5 horizontal lines,8 vertical lines, 21 single letters, 1 red/greenProgram: 2 kinds, each program contains up to 30 stepsLamp ... , 5 horizontal lines,8 vertical lines, 21 single letters, 1 red/greenProgram: 2 kinds, each program contains up to 30 stepsLamp ... , “E” Snellen, “K” Letter, Children, “8” Number defiler: Red /Green)Number of masks: 60 Program: 2 kinds, each program contains up to ...