NT-907 is the Light and Sound Delay Fuze cartridge.

The NT-907 sound & flash delay fuze 40 x 46 mm cartridge was designed to penetrate windows and doors and produce a noisy blast effect and a hard blinding flash. In addition to the loud sound and the blinding flash, the NT-907 produces a significant overpressure that adds to the disorienting physiological effects. It will penetrate normal glass windows or commercial hollow-core doors up to 40 mm.