1. Support PCIe 5.0 x4, compatible with gen3/gen4/gen5. 2. Gold finger gold plating process, gold thickness up to 10U, the same level as RTX4090 graphics card. 3. The product uses high-quality materials, PCB workmanship is precise, copper thickness is thickened to 1oz, no deformation. 4. How to distinguish the front and back of R74A: The side where the M.2 NVME Key-M connector is located is the front side. Please distinguish the front and back before inserting the device. Please do not insert it in reverse. There is a risk of burning the device if it is inserted in reverse. Our store is not responsible. 5. The LED light of R14A is a read/write light, and flickering during use is normal.The light of R74A is a power light, which remains on continuously during proper installation and use; D2 light is a read-write light, and flashing during use is considered normal; D3 light is a fault light, and it cannot be used normally when it lights up. Specifications: Product name: PCIe 5.0 EDSFF E1.S to M.2 NVMe adapter Product model: R74A Transfer speed: 128Gb/Sec (PCIe gen5 x4 Max.) support Dimension: support M.2 NGFF key M(2230) 22mm x 80mm NVMe card Application:EDSFF E1.S to M.2 NVMe adapter extesnion riser card Colour:black Material:PCB Purchase precautions: 1. Be sure to identify the direction when inserting the product, do not insert it in reverse or offset to prevent burning the device. 2. Limited to purchases specified by product engineers 3. Only supports the general version of M.2 NVMe SSD, does not support M.2 WiFi wireless network card, does not support M.2 SATA, does not support for / network card 4. The purchased product only includes NVME M.2 to EDSFF E1.S adapter card (R74A), does not include SSD solid state drive and PCIe adapter card. Due to different batches, there may be differences in product appearance and printed text, which not affect use Package Contents: 1 * PCIe 5.0 EDSFF E1.S to M.2 NVMe adapter 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.