As of 2017, all e-bikes in California are required to have a label that describes its type,top assisted speed, and motor wattage. If you are unsure about the type of your e-bike, contact your local retailer or the manufacturer.
 

Specification

• Quantity: 12 pcs
• Size: Per sticker is 1.5*1.5 inch
• Material: Vinyl
• Color: Black, White
• Usage: 12 pcs can be torn off individually, Peel & Stick
• Application: Frame and other smooth surfaces

The three classes are defined as follows:

• Class 1: e-bikes that are pedal-assist only, with no throttle, and have a maximum assisted speed of 20 mph.
• Class 2: e-bikes that also have a maximum speed of 20 mph, but are throttle-assisted.
• Class 3: e-bikes that are pedal-assist only, with no throttle, and a maximum assisted speed of 28 mph.