Description 1. case for 4B Model 2. With fashion appearance, it block the WiFi and Bluetooth signal 3. Thoughtful bottom design with ventilation holes on both the bottom and sides, beautiful and practical, efficient heat dissipation 4. Clever hole design and precise opening that each interface can be highly attached to the motherboard 5. Simple assembly to form, no cumbersome wiring, no worry about wrong wiring, more stable and safe use Due to different batches, there may be differences in product appearance and printed text, which will not affect use. Colour:Black Material:Metal Package Contents: 1 * Expansion board 4 * Heat sink 1 * Case 2 * Screwdriver 4 * Copper pillar 5 * Screws 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.