Function of siren

The cheap police sirens in this paper refers to the one installed on the vehicle and its functions are as follows:

1.Reminders

The siren for sale has eight basic tones. In case of emergency, emergency vehicles often start the alarm, so as to inform pedestrians and passing vehicles on the road that if there is an emergency, please avoid it in time. At the same time, it can also remind other emergency vehicles to avoid collision.

2.Warning function

Warn the criminal to stop the criminal activities in time, and convey the arrival of rescue workers to the victims, so as to make them relax.

Why custom siren box

First of all, our products will belong to customized products, which is connection with the use scenarios of products and national laws and regulations.

siren box is mainly used in medical aid, police, fire and other emergency industries, as well as municipal, cleaning and other industries. Therefore, the tone used by the security alarm siren is also different, which needs to be purchased according to the scene; different types of siren switch box can be selected according to the different use scenarios.

In addition, the laws and regulations on sound decibel are different in each country.

Customized scope

1. The basic tones
2. Sirens type of function

If you want to know the difference between these siren modes, please click here

What are the categories of police siren

police sirene can be divided into two types: integrated siren and split siren

Integrated siren

The integrated sirens cops is operated directly on the panel. On the panel, there will be corresponding buttons, and the user can directly control the function of the siren sounds through the panel buttons.

Split siren

It can directly control by hansle of the split cop horn. And the handle replacement is more convenient. The advantage of this product is that it can make the operator have a wider range of activities, and can directly switch the required alarm functions through the handheld alarm handle. We can divide it into single handle alarm and double handle alarm. Two handle siren is more suitable for ambulance.

Both types of alarms have a call function.

What products can the emergency vehicle siren use with (speaker, lightbar)?

The emergency vehicle siren can be used with our horn and police light bar. As a professional manufacturer of emergency equipment, we can provide you with the necessary supporting products

Why should use them together

First of all, the horn is a necessary supporting product of the siren. The horn is installed on the roof of the car and can convey the sound of the pa system truck. In addition, the sirens can control the flashing and sound of the full size lightbars.

The reason why sirens and speaker need to be used together is the power. First of all, the power of the speaker is the same as that of the siren alarm, otherwise it will burn out the circuit. If 100W siren and 150W speaker are used together, 100W siren will burn the circuit.

Buy siren box and speaker rules

1. Please purchase and use them under the law
2. Please customize not to exceed the maximum decibel specified by the city sound
3. We have specific packaging and cannot customize the installation you need
4. Our company’s warranty period for the police siren is still one year. If damaged during the warranty period, we can provide you with new accessories. If the warranty period expires, please bear the cost of the accessories.
5. The alarm sirens has a basic waterproof function. If you need a deeper waterproof function, please communicate with our salesman.

Would you choose a custom police siren

Regarding the customization of the siren for sale, the shape of the siren alarm shell on the market is similar. Therefore, it is mainly due to the performance difference in use.

This is one of the reasons why we choose Aole.We not only use high-quality materials, but also support product development

And then,I will introduce you to our pa systems components

Main component of alarm siren

The main components of the alarm include PCBA module, panel, shell, wiring harness, fastener, label, handle, etc.

PCBA module: first mock exam is the core component of the sirens, which includes circuit boards and electronic components.

Panel: main function of the panel is to control the siren alarm directly.

Shell: the shell adopts aluminum die casting technology

Harness: the harness includes the transition line and power line of the alarm

Handle: function of handle is to operate the siren directly from a long distance. Therefore, there are buttons on the handle, and the buttons will correspond to the corresponding functions. In addition, some handles have the function of calling. For the siren used in ambulances, we suggest to use our newly developed cjb-8ns double handle alarm siren, which can make the communication between the front and rear personnel more efficient.

If you want to know the double handle 400 watt siren, please click here.

The minimum order of car siren

We set the sample order, so you can buy it with one. If you want discount, please get an order that the quantity of 50. Of course, if you buy 100, we will give a stronger discount.

In addition, everyone needs to pay attention to the validity period of the quotation. Because raw materials are subject to fluctuations in international market prices, product prices will fluctuate

Quality inspection process of police siren sound

1.Place the product on the workbench and check the appearance of the upper cover.

First, check the surface should be free of scratch and particles

Bubble, no obvious deformation and damage and other defects: before and after the two types of label silk should be clear and legible, writing

No broken pen, trailing and other adverse phenomena.

2. Then check the appearance of both sides of the cover.

The surface of the side cover should be smoothly and freely from paint peeling, particles and rust. Silk screen of the side cover should be clearly and legiblly. Each wiring harness terminal should be pulled gently without looseness. The color of each wiring harness should be consistent and meet the color requirements.

4.Place the product, plug in the power cord and lamp control line, and connect the adapter and its number

At the same time, check the appearance of handle panel and bottom plate.The surface shall be free from scratch, poor spraying, damage and other defects. The front and rear punctuation shall be clearly distinguishable, and the writing path shall be free from broken pen, trailing and other defects.

5.Adjust the siren switch

Gently touch the power switch of the handle, adjust the panel tone in turn, and press “1” to “7” to observe whether the conversion cycle and high and low frequency of each tone segment in the alarm tester meet the standard requirements,

At the same time, turn the “Vol volume” button to the maximum, listen to the loudspeaker, and the pronunciation should normally. And the AC voltmeter should be ≤ 30W. Finally, adjust the alarm tone to the “silent” state.

6.Adjust the tone

Touch the “overtaking, siren” button on the panel respectively to switch to the corresponding tone, and return to the current tone after release. Then touch the “main light, auxiliary light” button on the panel,

The corresponding indicator light and load bulb on the observation panel should be normally on, and the negative ammeter should be less than or equal to 8A.

7.Hold the handle of the microphone

Hold the handle of the microphone, press and hold the microphone button, and exhale gently with your mouth facing the microphone. The loudspeaker should exhale

At the same time, observe the oscillograph waveform output should be normal: finally, tap the cover

Finally, check whether the indicator lights and loudspeakers are normal, and check whether there are foreign bodies in the machine

What siren does the NYPD use?

NYPD, also known as the New York City Police Department, is planning to equip all its new cars with the most advanced siren alarm, known as the Rumbler.

The system uses a bass speaker to produce a strong bass and a harsh police siren sound effect. Make it easier for pedestrians to feel and hear. It can sound like a traditional police horn, and it can also send out various kinds of alarms. Different from the previous sirens alarms, the bass effect is very strong in actual use, which can shake a glass of water on the table to move

How are police siren for sale made?

Nowadays, electronic police siren is gradually replacing the design of police car siren. However, many of the fire truck siren sound still work by the same principle as the disc siren.

In this design, the motor rotates the fan, which rotates in the grooved drum. The fan draws in air from the front and then discharges it from the side. Air burst occurs when the fan opening is aligned with the slot in the drum. Similar to the perforated disk, the fan basically cuts the airflow into separate explosions, and the frequency of the explosion determines the pitch of the police sirens sounds.

The working form of cop sirens is a simple mechanical device which pushes the air flow to the rotating multi hole disk. As the disk rotates, air flow is interrupted by alternating. The resulting pressure fluctuations produce a series of regular pressure waves, which we regard as sound. The number of holes in the disk determines its frequency. And rotational speed of the disk also affects the tone of the sound, which is considered to be the most typical wailing alarm. The page can calculate the exact frequency of the tone by multiplying the number of rotations per second by the number of holes on the disk.

What is wailing siren?What is the frequency of a police siren?

This is a special kind of cop sirens, in which the sound output of the sirens increases and decreases in a predetermined format. Between crying and crying, the notes change constantly. The most common types of sirens are 4 seconds on and 4 seconds off. This type of sound output is generated with the help of the warbling relay control unit. The circuit turns the alarm on for 4 seconds and then turns it off for another 4 seconds, which is the standard wail 600 – 1200 Hz @ 12 cycles / minute.

Why do siren for sale have different sounds? What are the different types of sirens?

Sirens horn is more than one. For ordinary people, the difference between sirens, fire engine sirens or ambulance sirens may not sound so obvious. After all, for ordinary people, it’s more just noise. However, for the police and emergency personnel who operate these alarms, the difference between these noises is not only very important, but also worthy of attention and analysis. Because for different purposes and situations, there will be different sirens.

Next, we will describe different sirens, how to use them, and why the police sometimes use one siren alternately to emit different frequencies, or switch between different sirens.

What is the difference between a police siren and an ambulance?

The police car has a standard electronic siren Alarm) can be operated through the buttons on the console in the car, and they usually have three settings. They have whale sound, which is a typical alarm. The sound will go from high to low, from high to low, and then it will sound a, and the alarm sound will fluctuate up and down as quickly as yelp. Then they have another setting or are not often used, which sounds like an old la Horn, most of which have electronic gas horn or real gas horn, pay attention.

If you want to know the detail of siren sound, please click here.