... 650HzEffective range: 1.5kmSingle ToneNet Weight: 12kgsCarton Size: LK-120S is our newly independent researched and developed human machinery pedal ... siren, Compare with other similar products ,the LK-120S sirens have smallest volume, loudest decibels, lightest weight, the ... , anti-oxidation, anti-crack, and other characteristics. LK-120S is made of light weight aluminum alloy materials . It is ...