High Quality Professional Factory Air RAID, Hand Operated Sirens with Rail Stand Lk-120

Product Description

Manual alarm without power supply,but can provide an effective alarm in the place that without power supply.Simply shake the handle clockwise through artificial hand,speed arrive junior (50-80 rev / min) can achieve the desired effect alarm,the sound sharp,shocking large, penetrating power.Alarm sound depends on the handle speed of shaking.

Handcranked siren small size,light weight,easy to carry,easy to install,does not require any tools,Only need 0.15 square and where people stood can normal operation ,the mobility of the job is very strong.

It is an ideal Alarm equipment when Civil defense,detention centers,prisons,mines,airports,pastures,oil depots,warehouses, hotels,restaurants and other business units Critical situation occurs.

Product name	Hand crank alarm
Product model	LK-120
Acoustic audio	600±20Hz (depending on hand cranking speed)
Audio frequency	600 ± 20 Hz (depending on hand-crank speed)
Sound level	1252dB(A)@1m

Application areas:An ideal alarm equipment used by civil defense,detention centers, prisons, mines, airports, pastures,oil depots, warehouses, hotels, hotels and other enterprises inthe event of a critical situation.

Alarm principle:The hand-cranked siren is manually rotated bythe crank handle, accelerated step by step through thetransmission of the gear box, and then driven by the transmissionblock to drive the ringing wheel to run at high speed. During thehigh-speed operation of the whistling wheel, the absorbed airproduces high-speed and high-pressure squeezing out to the fixedwindow of the fixed wheel at the same time, thereby playing therole of alarm