That is an ultrasonic device
Batman Carries A number of Compact Custom Built Ultra High Frequency Sonic Devices in His Utility Belt As Standard Equipment
vs
Metas with enhanced senses such as Superman, Man-Bat, Timberwolf
Animals trained as attack weapons set on him / Animal traps set for him
Hostiles with an open comm line (which may or may not be an encrypted comm line -which he's haxxed -or his AI has hacked via sattelite).
He Got The Kryptonian Good There.
That play or to give it it's proper name - That Batman Gambit wouldn't have worked nearly as well if some one else ie: Lex had tried it. If it had been someone like Lex they'd have had to use a very convincing aid to hook Supes into total - complete focus on - the next word to come out of them - If that had been Lex Supes would have been staining in multiple directions --- could be a kyrptonite warhead homing in on him -- or some shielded device directed at him -- but Bruce going all juicy gossip on him -- Lex and Darkseid who every one knows has minions lurking wouldn't have been able to get Supes like that - completely unguarded.
The Speedforce Crew completely forgetting their powers... while Superman doesn't get to forget he has enhanced audio and can levitate
Bad Bad Writing
Originally posted by shiv
That is an ultrasonic whistleStandard Utility
Bats always has at least 2 ultra high frequency tools
1 wind instrument
1 pre programmed / pre prepped with multiple presets electronic audio system
three if you count his own vocal phonation (nobodys got breath control like Wayne)
Have you proof that in that scan, he is using a device?