Features: It can help the laptop to use the independent external high-performance graphics. can be used to use any of the pci-e interface equipment. To improve the performance of the laptop, so that they can for play the huge game requirement high high-performance graphics. support for new graphics cards shipped after 2015, the compatibility of Thunderbolt-compatible 3 or Thunderbolt-compatible 4 is high and the operation is easy. The model that supports the power supply is for DELL 12V/18A/220W power supply or else. Please prepare or purchase the power separately. Specifications: Transferspeed:PCIe 3.0 x4 , 32G/bps (Max.) Size: Pls see the Pictures Application: eGPU for NUC / ITX / STX / Notebook PC Package Includes: 1X External Graphics Adapter Board note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment.