Invacare Pronto M51 Sure Step Mobility Wheelchair Scooter Powerchair. The item "Invacare Pronto M51 Sure Step Mobility Wheelchair Scooter Powerchair New Battery" is in sale since Monday, May 21, 2018. This item is in the category "Health & Beauty\Medical & Mobility\Mobility/Walking Equipment\Wheelchairs". The seller is "edwaragnic_0" and is located in Hesperia, California. This item can't be shipped, the buyer must pick up the item.