Voice Synthesizer

The Voice Synthesizer is a device used in Batman: Arkham Knight.

Like the Remote Hacking Device, it helps with accessing security panels, except the Voice Synthesizer accesses panels that requires voice activation. It also has the ability to manipulate henchmen during Predator Mode, as well as Riddler Robots for the Riddler's Challenges. It replaces the Sonic Batarang in Arkham Knight.

Arkham Knight Incident
Batman created this device from a voice modifier that he had previously taken from a Militia driver who masqueraded as The Arkham Knight, and gave it a calibration of Harley Quinn's voice in order to regain access to Panessa Studios after Harley took over and reprogrammed the security panels to activate only when her voice was given. After Batman defeated Harley, he reprogrammed the security panels to their original state.

Later, when Batman went back to the Stagg Enterprises Airships to find Simon Stagg and learn how to stop the Cloudburst, he learned that Stagg had increased the security in his blimps and calibrated the Voice Synthesizer to use Stagg's vocal pattern, which allowed him to gain access to panels that required Stagg's voice recognition.

After Batman found that Stagg had escaped his containment and the Arkham Knight's Militia patrolled the blimp for him, Batman gave the Voice Synthesizer a calibration of the Arkham Knight's voice disguise in order to manipulate the Militia and took them down.

After Batman defeated a Riddler Robot in a Riddler Challenge, he calibrated the Voice Synthesizer in order to gain control of Riddler's robots for the challenges ahead.