Airsoft acoustic grenades F-1 from a Russian manufacturer. The time from pulling the check to the explosion is 4 seconds. The radius of destruction is up to 30 meters.

From reviews:"The grins came quickly, the body of the fragmentation complex is made of something like ferrite, keeps its shape, but is subject to crumbling, which was noticeable in the form of small chips in some places. I experienced one literally half an hour after receiving). "efok": at the moment of detonation, there is a small pop, like from the son of a small firecracker "nutcracker", the response time was about 3-4 seconds. I personally expected more from the power of the explosion, but the cotton will be normal in the room!) The explosion in the ravine produced a kind of rain from the crumbs of the hull. "
Airsoft acoustic grenades F-1 from a Russian manufacturer. The time from pulling the check to the explosion is 4 seconds. Damage radius - up to 30 meters. 0