Features: 1. Suitable for laptops with for 3 or 4 interface. 2. Easy to use product has user manual. 3. Compatible with most mainstream graphics cards 4. Support reverse charging 5. The dual interface supports daisy chaining and comes with SFX and ATX brackets, making it easy to install the graphics card, power supply and base together. Description: 1. Interface: Thunderbolt3/4 2. Speed: 40Gbps 3. Daisy chain: supported 4. Power supply: ATX/SFX/FLEX/others 5. Graphics card size: unlimited 6. Other features: USB 3.0 expansion support 7. PD charging: support (Max Max 20V3A@60W) 8. USB function: USB: 5V2A/Type-C: 5V3A version: 85W Note: Graphics Card And Power Supply Not Included Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Will Not Affect The Use Material: ABS+metal colour: As Shown Package Contents: 1 x Graphics Card Expansion Dock 1 x SFX Bracket 2 x Support Base 2 x Screws 1 x ATX Bracket 1 x Data Cable 1 x Screwdriver 1 x Chinese and English instructions Only 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.