-20*4-并口连接-3.3V, 5V可选-蓝底白字,白字蓝字,黄绿底黑字多种显示效果可选1. 20X4 Characters2. Parallel interface3. 3.3V 5V power supply optional4. STN-YG, STN-Gray STN-Blue with YG White LED backlight optional