1. The CB1 core board is a computing core board similar to the CM4 for 2. CB1 core board can be equipped with PI4B expansion board, the performance can be close to for 3B, and can also be used instead of for 3B3. Due to the modular form, CB1 has a high degree of modularity, which is convenient for users to use DIY4. CB1, cost-effective, can be a low-cost option for 3D printer users running Klipper CB1 with ordinary motherboards5. Efficiently run Linux system, support Debian, programmableCB1 core board:Model: BTT CB1 motherboardCPU: Allwinner H616, quad-core Cortex-A53 @1.5GHzGPU: Mali G31 MP2, support OpenGL3.2RAM: 1GB DDR3L SDRAMBTB-transposon: same as for CM4Size: about 55x40mm/2.16x1.57inColour:blackMaterial:PCBPackage Contents:1 x BTT CB1 core boardOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.