It also should be controlled manually and the material of base is aluminum. It is installed on the vehicle floor, when need it, you just unfold the ramp. There will be a slope which can help the disabled get into/out of vehicle.
The operation of manual wheelchair ramp is easy, simple, independent and wholly manual, because it doesn't need to connect with vehicle electric system. This ramp takes no space of vehicle. Moreover, the platform of ramp and the floor of vehicle are at the same level, so there is no effect for passengers.