Here's a new concoction from NerdGamer PH designed for room clearning in airsoft CQB games... "Just a short demonstration of Breach Bang Clear, an 'acoustic signal device' for both recreational and training use. Essentially, it's a noisemaker, capable of distracting enemies with its loud report which is around 120-130db, or as loud as a firecracker (fivestar). It's made out of PVC, light, easy to use and is very, very loud, especially inside rooms."