Red Manual Hand Crank Air Raid Alarm with 110dB Output and Aluminium Alloy Body

This red manual hand crank air raid alarm is a portable siren designed to produce a loud, recognisable sound without batteries or mains power. The stated sound output is 110±2dB at an audio frequency of 550±20Hz, and the quoted transmission distance is 1000Φm. Operation is entirely manual: you rotate the handle, and the gearbox accelerates the transmission step by step to generate sound. The sound level depends on how fast you turn the handle, giving you direct control over the output. The body is made from aluminium alloy and finished in red. With dimensions of 115mm length, 202mm width, and 9.1 inch height, it is compact enough to carry and store. The handle and cranking lever fold, which helps with portability. No power supply is required, so it can be kept ready for situations where you need to draw attention, such as events, drills, or crowd signalling. Please allow for a 1-3mm measurement error due to manual measurement, and note that the colour may vary between displays.

Features and Construction

The alarm is built around a manual crank mechanism with a folding handle and lever. Its metal body and quoted acoustic figures are the main practical details, while the compact size supports carrying and storage. The design does not depend on external power, so there are no batteries or cables to manage.

Material and Build

The siren body is made from aluminium alloy and presented in red. This metal construction gives the unit a rigid feel and suits the mechanical crank action described in the source information. The handle and cranking lever fold, which reduces the overall footprint when the alarm is not in use. The gearbox inside the transmission is designed to accelerate step by step as you rotate the handle, turning manual effort into sound. No power supply is needed, so the build is self-contained. The colour is red, though the exact shade may appear slightly different depending on your display.

Size and Practical Fit

The stated dimensions are 115mm length, 202mm width, and 9.1 inch height. These compact measurements make the alarm easy to hold, pack, or store when it is not being used. The folding handle and cranking lever add to the portability by tucking away after operation. A manual measurement error of 1-3mm is possible, so the actual size may differ very slightly from the figures quoted. The quoted transmission distance is 1000Φm, which gives an idea of the area the sound is intended to cover. Because it needs no power supply, there is no cable or battery compartment to account for in the overall size.

Uses and Placement

This hand crank siren is intended for getting people's attention, including at sporting events where you might want to support a team, and for other applications where a loud signal is useful. Its manual operation means it can be used wherever you can turn the handle, without needing a power source nearby.

Event or Professional Use

The 110±2dB output and 550±20Hz frequency are stated to produce a powerful, universally recognised sound, which suits situations where you need to be heard over background noise. At sporting events, it can be used to cheer on a team or draw attention. For drills, crowd control, or emergency signalling, the manual crank lets you keep sounding the alarm for as long as you can turn the handle. The quoted transmission distance of 1000Φm is relevant when the alarm needs to carry across an open area. Because the sound depends on handle rotation speed, the operator can vary the intensity from a steady signal to a more urgent burst.

Everyday Home Use

At home or in a workshop, the alarm can be kept as a manual attention-getter for occasions when a loud signal is needed. It requires no batteries, so there is no need to check or replace power cells before use. The compact 115mm by 202mm footprint and 9.1 inch height mean it can be stored on a shelf or in a cupboard without taking up much room. The folding handle keeps the profile tidy when not in use. It is not a replacement for mains-powered alarm systems, but it offers a self-contained way to make a loud noise when you crank the handle.

Benefits and Buying Value

The main practical benefits come from the manual crank design, the stated acoustic output, and the compact aluminium alloy body. Because no power supply is required, the alarm can be kept ready without depending on batteries or cables, and the folding handle supports easier carrying and storage.

Reuse and Low Maintenance

Since the alarm is operated by hand and needs no power supply, there are no batteries to replace. The aluminium alloy body and mechanical crank mechanism are the stated construction details. Keeping the unit dry and storing it with the handle folded are sensible low-risk habits for a metal mechanical device. The source information does not list specialist care instructions, so simple, practical storage is the safest approach. The 1-3mm measurement tolerance and possible display-related colour variation are the only stated caveats. Regular visual checks of the handle and lever movement are reasonable before use, without needing any specialist maintenance routine.

Why Choose This Product

This air raid alarm is a hand-cranked siren with a stated 110±2dB output, 550±20Hz frequency, and 1000Φm transmission distance. It is made from aluminium alloy in red and measures 115mm length, 202mm width, and 9.1 inch height. The folding handle and cranking lever make it more portable, and the absence of a power supply requirement means it can be used wherever manual cranking is possible. It is suited to getting attention at events, supporting a team, or other situations where a loud, recognisable sound is useful. The sound is controlled by how fast you turn the handle, so the operator can adjust the output to the moment. If you want a compact, manually operated alarm that does not rely on batteries or mains power, this model provides those specific features.