Selectable Lightweight Attack Munition

The Selectable Lightweight Attack Munition, better known as the SLAM, is a small explosive device, dark green in colour, that was originally intended to be a usable weapon in Half Life 2 but was cut from the final release, though the Combine do use them in the game. (They are used by the soldiers during the defense of Nova Prospekt, and also in the city, occasionally, although the Nova Prospekt SLAMs are a different color and shape.) The SLAM functions in a similar manner to the Laser Tripmine in Half-Life. It is usable in Half Life 2 Deathmatch. Its name and acronym may suggest it was a US military design, that was taken up by the Combine when they enslaved Earth.

Usage
The SLAM has two modes of operation.

It's primary use is as a laser tripmine. Once placed, it will emit a red beam, if anything breaks this beam the device will detonate. In this way SLAMs can be used for two purposes, creating traps and area denial. SLAMs used to create traps can be placed in stairwells or around corners to snag careless individuals who run into them. Alternatively, SLAMs can be placed in clear view, enemies are less likely to run into them, but are forced to slow down to deal with or avoid the threat, a situation the trap-setter can take advantage of. The SLAM can be placed on any solid surface, even on physics objects, although this is very dangerous, as bumping the object can detonate the device, this can be a good (though risky) way to set up a trap. You can block a corridor or doorway with crates or other objects, and place a SLAM on the junk where it is not visible from the other side. Then, when your opponent tries to clear the junk out of the way so they can pass, they'll detonate the device without ever knowing it was there.

The second mode is remote-detonated. If you drop one or more SLAMs on the ground you can remote detonate them with the secondary fire key. Taking these two uses into account, the SLAM combines the functions of both the Laser Tripmine and the Satchel Charge from Half-Life 1.

If SLAMs are blocking your way, they're easy to deal with, as long as you spot them before you walk into the trap. Simply shooting them or throwing an object through their beam will cause them to detonate. When detonating an SLAM, remember to stand back or you will be caught in the explosion. Setting up multiple SLAMs can cause chain reaction explosions.