The acronym "ZSU" stands for Zenitnaya Samokhodnaya Ustanovka meaning "anti-aircraft self-propelled system" the "23" signifies the bore diametre in millimetres; the "4" signifies the number of gun barrels. It is named after the Shilka River in Russia. Afghan soldiers nicknamed it the "sewing machine" due to the sound of its cannons firing. It is also referred to by its nickname of "Zeus" derived from the Russian acronym.
ATTENTION
FOR FIRE THE MISSILE FIRS PRESS RESPECTIVELY AG4 AG5 AG6 AG7 AFTER LUNCH THE DOOR OF EACH ONE MISSILE BOX SHOT THE MISSILE.

ATTENTION 2
AG1: TURN ON LIGHT
AG2: TURN ON RADAR
AG3: TURN UP MOTOR FAN
AG4-5-6-7: LAUNCH DOOR OF MISSILE BOX

Because the original version of this design needs ModTracker 2 to run properly and it also needs a Windows system, I rebuilt it for the phone.