TR/9 trip mine
From Halopedia, the Halo wiki
The trip mine is deployed as an anti-infantry or anti-vehicle weapon. It is sensitive to pressure, and can be detonated by weapons fire or the close proximity or impact of a vehicle or infantryman. It is apparently capable of detecting the anti-gravity generators found on Covenant vehicles. The mine will explode after ninety seconds if not detonated before then. The TR/9 trip mine saw usage during the Battle for Earth and the Battle of Installation 00, both by UNSC forces and by Jiralhanae that had acquired caches of the mines.
Once deployed, it can be identified by a high-pitched beeping noise, four inner spokes that rise up, and a distinctive flashing bright orange light on its top. Its blast radius is considerably larger than a grenade or rocket explosion, throwing vehicles and personnel into the air.
List of appearances