It's pretty straight forward. I can assure that my bike is a class 3, provides assistance to 28 mph, and has a throttle. See below.There are Three Classes of electric bikes. Only the even numbered ones have throttles. The ones that are odd numbered do not have throttles. The ones that are less than three have a maximum speed of 20Mph. The ones that are more than two, but not including two, can go 28Mph. I know it is confusing.
This is the info for my bike:
Class 3 designation emblem on head tube:
Picture of throttle: