The most prominent feature of the wrist-gauntlet is that it has a self-destruct mechanism that a Predator can use as a last resort. When it feels that it’s close to death, it activates its control panel causing the self-destruct to count down. Predator symbols count down on the gauntlet before a huge explosion occurs destroying everything in the vicinity.
As Dutch and the Jungle Hunter battle, Dutch outsmarts the Predator and crushes him with a huge log. As the Predator is close to death, he activates his self-destruct device. Dutch realises what’s about to happen and escapes. The subsequent blast is huge, destroying a massive area in the jungle. This is really the only time in all the films that a Predator successfully uses the self-destruct device to kill himself in the process. (We did see a Predator do it in the flashback sequence at the top of the pyramid in Alien vs Predator).
Predator 2 (1990)
City Hunter never got a chance to use the self-destruct device in Predator 2. After Harrigan escapes the meat locker, the Predator is in pursuit. The both fall off the ledge of the building and the Predator activates his self-destruct device. As the timer counts down, Harrigan manages to use the Smart Disc to sever the Predator’s arm, stopping the device from working. Interestingly, the self-destruct mechanism ceases to function however in Alien vs Predator, it is shown that it can be used as a remote explosive not connected to the Predator.
Alien vs Predator (2004)
In Alien vs Predator, the self-destruct mechanism is used in the flash-back sequence when the three predators on top of pyramid are battling thousands of aliens and they have no other choice but to self-destruct. It’s much larger than the self-destruct used in the first film. The mechanism is also used at the end of the film when Scar takes off his self destruct device in the Egg Chamber and sets it to go off in a few minutes. Lex and Scar escape just in time and the device destroys everything and causes the surface to collapse.
Aliens vs Predator Requiem (2007)
In AvP Requiem, the Wolf Predator activates the self-destruct device on a dead Predator which destroys the Predator ship.
Predators (2010) & The Predator (2018)
It’s never used in Predators or The Predator but it’s assumed all the Predators have the self-destruct mechanism.