Noise barrel, 25 ml, one more unique novelty on Russian the market, "the individual siren", makes a shrill sound to 130 dB. Also the signaling device is used as an otpugivatel of animals. The audibility of a signal is 1-3 km. The barrel is enough for 200-250 signals lasting 1-2 sec. Expiration date of 10 years.
For comparison. Import analogs have smaller volume - to 16 ml, smaller sound influence - to 110 dB, but higher price.