Your Mevo has front and rear parking sensors to assist you in getting in and out of tight carparks, as well as a reversing camera to help guide your way. When using these aides it's important to also trust your instincts and, if necessary, get out of the car to check your clearance and blind spots.
When you put your Mevo into reverse, both the reversing camera and parking sensors will enable automatically. The sensors will begin beeping as you approach a solid object and will get faster as you approach.
You can enable the sensors and camera any time by pressing the corresponding button on the dash, but they will only engage when your Mevo is traveling at a safe speed.