Stun grenade

Stun grenades are generally non-lethal weapons used by the Tau'ri. They take 1.5 seconds to detonate once the pin and spoon is detached from the grenade. They are filled with a mixture of aluminum and potassium percolate that when ignited, would produce a high pressure wave that will overwhelm the intended target with intense light (about the brightness of 2.4 million candles) and sound (175 decibels), hence stunning the enemy's eyes and ears for approximately ten seconds.

The Atlantis Expedition used such weapons against the Wraith and the Genii. Within the first few weeks of operation, in 2004 they used them to ambush the Wraith in the hopes of capturing one, by stunning a Wraith warrior, and later tasering him. Unfortunately, the warrior managed to blow himself up before capture. Later in 2005, Atlantis 1 used spare flashbangs to use against Acastus Kolya and his fellow Genii from stealing a Potentia, a Zero Point Module, which the expedition needed to power Atlantis.