And if they have a contract with a bus company they can write something like this:
ATWEC has signed a contract with bus company xyz. Company xyz has 5000 buses in their fleet and will equip all their buses with atwecs equipment. Atwec will do the installation on all their buses and we will also sell them extended warranties for all equipment purchased. ATWEC will be making $2,000,000 on this deal alone.