This is a basic 20 character by 4 line dot matrix LCD display controller module designed for different 3D printer motherboards. With different adaptor you can connect to the smart LCD with Geeetech RAMPS1.4 Sanguinololu Megatronics and Rambo. There is a SD Card slot on the back of the LCD Module connecting it with the controller board of 3D Printer you don't need your pc any more just need insert your SD card into the SD Slot you can print your 3D designs without PC. Display: 20 Characters x 4 lines Module Size: 98.0 x 60.0 x 14.0cm Viewing Area: 76.0 x 25.2cm Character Size: 2.95 x 4.75cm Controller IC: S6A0069 or equal Supply voltage: 5V