The interior features a highly customisable modular design, similarly to the competing Arrival Bus, with two or three doors and a maximum of 30 seats.

[2] Each seat can be fitted with reading lights, USB phone charging ports and under-seat lights, with wide-screen monitors fitted throughout the cabin to display next stops and other information.

[3] According to Switch Mobility, the E1 is the lightest electric bus on the market.

[4] At launch, the E1 was aimed at the continental European market,[2] with the Optare MetroCity EV still to be constructed for the United Kingdom.

[5] The E1 will be the first model to be produced at Switch Mobility's newly constructed carbon neutral manufacturing facility in Valladolid, Spain, commencing with two production lines dedicated to the E1;[4] additional construction will take place at the existing former Optare factory in Sherburn in Elmet, Yorkshire.