Conversion module USB to TTL serial module USB to TTL serial module Product Parameter Brand:Firefly Size:29mm * 19mm Reference material Download driver: http://www.prolific.com.tw/US/ShowProduct.aspx?pcid=41 Picture Connection Method PCIe(B-KEY) to SSD Adapter board Product Parameter Brand:Firefly Specifications: Bandwidth:up to 4GB / s Description:Suitable for Firefly-RK3399 or devices with PCIe M.2 (B-KEY) Connection Method PCIe M.2(B-KEY) to SATA3.0 Adapter Board Product Parameter Brand:Firefly Specifications: Interface: Two SATA3.0 interface for 2.5 "SSD or HDD hard drive Description: Suitable for Firefly-RK3399 or devices with PCIe M.2 (B-KEY) Connection Method