Enhance Your for : Upgrade your for 's functionality with our GPIO Extension Board! perfect for keeping your device cool while running intensive tasks efficient heat dissipation and improved performance of your for 4B, 3B+ Easy Installation: This extension board is designed for easy setup and use, allowing you to enhance your for quickly without hassle. It's an ideal choice for both beginners and experienced users looking to expand their projects Compatibility: Fully compatible with for Model B, for 3B+, this extension board seamlessly integrates with your existing setup, ensuring a and optimal functionality Due to different batches, there may be differences in product appearance and printed text, which not affect use Color: As Shown Material: PCB Package Contents: 1 x Dual Cooling Fan 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.