Scatter Grenade

Scatter Grenade is grenade closely resembles a standard frag grenade. It has a 6-second delay after the pin is pulled. When the grenade discharges, it fills a Sm radius with smoke and harmless particles. The cloud is not only impenetrable to normal sight, it also makes IR and thermal imaging useless. The cloud lasts for 5 rounds in calm winds.

Source

 * Chromebook Volume 2, pg.49
 * Blackhand's Street Weapons, pg.40