EX1 "Proximity Charge"

Available with the "Getting' Busy" DLC pack or by playing with someone who has it, the EX1 "Proximity Charge" is placed in the grenade spot. When thrown, a half-sphere of red light/lasers appears that, when entered by either the player(s) or an enemy, causes the charge to detonate with a variable force depends on the thrower's explosives skill. Due to the fact that the player and their partner (if any) can set it off, it's advised to be careful when using this in close quarters and to warn your partner if you're going to use them.

In Crackdown 2 it returns renamed Proximity Mine with a few updates.