Controls on the projectile included a two-position, height-of-burst switch, which could be set to near-ground or medium-height detonation; a safety switch with 'safe' and 'arm' positions; and a time setting dial that allowed a time delay between 1 and 50 seconds before the fuze armed. If the time delay was greater than the time-of-flight, the weapon would hit the ground before it armed and not detonate. The time dial also had a 'safe' setting, and so acted as a second safety switch.