8000rpm 2km/h car says to 電訊台 https://www.google.com/search?q=usb+3.1+sfp&client=ubuntu&hs=5AE&channel=fs&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiT-vX6wNzhAhWO62EKHcejD3kQ_AUIDigB&biw=927&bih=913#imgrc=9H-e_I6xlT1wDM: