1、The intelligent controller includes an SD card reader, rotation encoder and a 20-character x 4-line LCD display. 2、You can easily connect it to your RAMPS 4 board using the ''smart adapter'' included. 3、After this panel is connected to your RAMPS 4, you do not need your computer and the controller will power your SD card. 4、The intelligent controller can do all the further operations, such as calibration, axle motion. No need to computer print 3D design, just store the G code design on the SD card. 5、Compatible with RAMPS 4 ,more convenient to use. Features: The intelligent controller includes an SD card reader, rotation encoder and a 20-character x 4-line LCD display. You can easily connect it to your RAMPS 1.4 board using the ''smart adapter'' included. After this panel is connected to your RAMPS 1.4, you do not need your computer and the controller will power your SD card. The intelligent controller can do all the further operations, such as calibration, axle motion. No need to computer print 3D design, just store the G code design on the SD card. Compatible with RAMPS 1.4 ,more convenient to use.  Specification: Size:15 x 5.8cm / 5.91 x 2.28in Package List: 1 x LCD Display Controller 1 x Adapter 2 x Connection Cord 1 x Knob Cap