Meet the Sound Grenade: a tiny device with a 120-decibel alarm to get you out of trouble. It weighs less than 1oz, so you can carry it around conveniently. At the same time, it has a loud siren to get you out of trouble. The siren sounds continuously for 30 minutes once you remove the pin.
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The Sound Grenade works under water and in 14F to 104F temperature range. Like what you see? You can get yours for under $20.
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