Zero Motorcycles has announced that their electric Zero S and Zero DS models have passed both U.S. and Canadian safety standards, and received a Certificate of Conformity from the Environmental Protection Agency.

The company is claiming a 455-mpg equivalent for both the S and DS, which use the same lithium ion battery and 4 kWh electric motor.

Both models are street legal, although the DS (Dual Sport) is designed for a combination of on and off-road use. Zero claims a range of up to 50 miles, and a top speed of 55 mph. Recharge time is said to be less than four hours.