BASE MOUNT LOUD! HAND CRANK MANUAL OPERATED AIR RAID ALARM METAL PORTABLE SIREN
Tornado Siren, Compact Portable 110dB Hand Crank Siren Sound for Schools for Industrial Places (Green). 1 x Hand Crank Siren. Item Type: Hand Crank Alarm. The faster the rotation, the louder the sound, and a trigger can open the blades to amplify the sound even more.