Manual Hand Crank Air Raid Alarm in Red Aluminium Alloy with 110 dB Sound

This manual hand crank air raid alarm is a portable, hand-operated siren designed to produce a loud, universally recognised warning sound without mains power, batteries, or any external supply. The aluminium alloy body is finished in red, and the unit measures 115 mm (4.5 inches) in length, 202 mm (8 inches) in width, and 9.1 inches in height. Its handle and cranking lever fold away, so it can be stored or carried more easily when not in use. The siren is operated by rotating the handle by hand, and the gearbox accelerates the transmission step by step to create the sound. Sound output is rated at 110±2 dB with an audio frequency of 550±20 Hz, and the transmission distance is given as 1000 Φm. This makes it suitable for drawing attention in emergencies, alerting crowds, or supporting a team at sporting events.

Features and Construction

The air raid alarm is built around a manual crank mechanism and an aluminium alloy body. Its practical design centres on portability, simple hand operation, and a sound that can be adjusted by the speed at which the handle is turned. No power supply is required, which keeps the unit self-contained.

Material and Build

The body is made from aluminium alloy, a metal material that supports the portable nature of the product. The red finish makes the alarm easy to identify. The handle and cranking lever both fold, which reduces the space needed for storage and transport. Because the siren relies on manual operation, there are no batteries or cables to manage. The build is intended for a hand-cranked air raid alarm that can be used in a range of attention-getting situations.

Size and Practical Fit

The alarm measures 115 mm (4.5 inches) in length, 202 mm (8 inches) in width, and 9.1 inches in height. These dimensions describe a compact unit that can be carried by hand or packed away when not needed. The folding handle and lever help reduce the overall bulk for storage. The transmission distance is listed as 1000 Φm, and the sound output is 110±2 dB at 550±20 Hz. Please allow a 1–3 mm error due to manual measurement. Colour may appear different depending on the display used.

Uses and Placement

This hand-cranked siren is intended for situations where a loud, recognisable sound needs to be produced without relying on a power source. Its manual operation makes it suited to emergency signalling, crowd attention, and sporting events, as well as other applications where a portable alarm is useful.

Event or Professional Use

The air raid alarm can be used to get people's attention in emergency drills, crowd control, or similar professional and event settings. Its 110±2 dB output and 550±20 Hz audio frequency provide a sound that is universally recognised as a warning signal. Because the sound depends on the rotation speed of the handle, the operator can adjust the output by cranking faster or slower. The transmission distance is given as 1000 Φm, indicating the intended reach of the signal under the stated conditions.

Everyday Home Use

At home, the manual hand crank alarm can be kept as a portable signalling device for emergencies or outdoor activities. It requires no power supply, so it can be stored without worrying about batteries. The folding handle and lever make it easier to put away in a cupboard, bag, or vehicle. It can also be used for getting attention at gatherings or supporting a team at sporting events. The red aluminium alloy body is straightforward to identify when needed.

Benefits and Buying Value

The main practical benefits of this air raid alarm are its manual operation, loud sound output, and portable folding design. It does not need a power supply, and its aluminium alloy construction and compact dimensions support ease of carrying and storage.

Reuse and Low Maintenance

Because the alarm is hand-cranked, it can be used repeatedly without batteries or external power. The folding handle and cranking lever help protect the unit during storage and transport. The aluminium alloy body is a metal construction that suits a portable device. No specialist care instructions are provided beyond the note to allow a 1–3 mm measurement error and the display colour variation. Keeping the unit dry and storing it with the handle folded are reasonable low-risk practices based on its materials and design.

Why Choose This Product

This product is a manual hand crank air raid siren with a folding handle, a red aluminium alloy body, and a sound output of 110±2 dB at 550±20 Hz. It measures 115 mm (4.5 inches) by 202 mm (8 inches) by 9.1 inches, and the transmission distance is listed as 1000 Φm. It requires no power supply and is compact for portability. The package includes one air raid alarm. It is a practical choice for anyone who needs a portable, hand-operated siren for attention-getting, emergency signalling, or sporting events.