Audible & Visible from Far Away - The siren horn sound is 110db, can be heard from 1000m away, and the flash strobe lighting can be seen from 1000m. Alarm Sound: 110db. No worry run out of power. Unique 4 modes: 24 hours with flash & alarm / 24 hours with flash only / in the night with flash & alarm / in the night with flash only.
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