The Bat-Signal was then used as the last resort to get in touch with the Caped Crusader. However, this Bat-Signal was largely replaced by Batman's Hot-Line, which was a direct telephone between Gordon's office and the Batcave. The Bat-Signal was the main contact method between Batman and the GCPD and Sergeant Harvey Hainer was in charge of activating the signal. For this purpose, a small light bulb and a phone connected to Commissioner Gordon's office was installed in order to notify Hainer the times when he had to activate the Bat-Signal. Some time later, an elderly police officer, Sergeant Harvey Hainer, who was no longer capable of patrolling the streets or going out on missions, was placed in charge of activating the Bat-Signal. Larger, changeable and more powerful carriage.Outer casing of duraluminium covered with bullet-proof glass.Bullet-proof glass handground for clarity.Super Carbon Arc Filaments to produce a beam 100 times brighter than a normal searchlight.

For this reason, Batman designed a new Bat-Signal with the following features: During it's early days, some criminals shot the Bat-Signal and others stole it to prevent communication between Gordon and Batman. The Bat-Signal played a very important role on Batman's crime-fighting career and soon it became a tool besides a summoning beacon. However, when Batman uncovered a large criminal network behind Gordon's demotion, the Mayor reinstated Gordon as Police Commissioner and the Bat-Signal was repaired. When Commissioner Gordon was removed from his charge, his replacement destroyed the Bat-Signal using an axe and ended the GCPD's connection with Batman.

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