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The Mosquito device MK4. The most effective way to move kids away from an area

Mosquito MK4 (Anti-Loitering device) Customise your own kit

Mosquito MK4 

The Mosquito, MK4 otherwise known as an anti loitering sound device, anti teenager alarm, teenager repellent or ultrasonic teenage deterrent. Call it what you will, but it is essentially a low power device that makes a pulsing sound similar to an alarm clock. This sound is just out of the range of an adults hearing, which is why it only bothers people under the age of about 25. The sound is not loud or painful, just highly annoying after a short period of time.

Over the 10 years since The Mosquito was launched, CSS have sold many many thousands of them worldwide and in 2017 it still continues to be the MOST effective and safe way to disperse groups of loitering teens from locations they are not welcome.

This page allows you to customise your own Mosquito kit. Whilst we supply security cages, PIR motion detectors, timers and remote controls, for most applications, activating the Mosquito via the switch on the power socket is sufficient. If you will have to mount the Mosquito below 3m / 9 feet though, we suggest purchasing a security cage. The Mosquito itself is cast zinc and is very durable and impact resistant, as it was designed for use in US prisons. That said, it is worth the extra precaution if being mounted low.

As this is a 'customise your own kit' page, you will need to purchase a power supply also. You can choose between UK 3 pin or EU 2 pin power supplies. If you require a power supply that is different to these two options, you can purchase 24v DC power supplies in your local area. Please ansure the power supplies are rated at greater than 500 mA.

Mosquito Device Overview

This video is about Mosquito Device

Mosquito Device Overview


Mosquito PIR
  • Mosquito PIR
  • The LX402 external PIR sensor is perfectly suited for use with the Mosquito MK4 anti-loitering device
  • From £102.00
Mosquito Power Supply EU
  • Mosquito Power Supply EU
  • Standard 15v power supply selected to ensure that power spikes are limited to protect your Mosquito™.
  • From £12.00
Mosquito Power Supply UK
  • Mosquito Power Supply UK
  • Standard UK 24v DC power supply with Standard UK plug
  • From £12.00
Mosquito Remote Control RF
  • Mosquito Remote Control RF
  • The Professional in-line remote control can be used with Compound Security Systems' Mosquito up to 100m range
  • From £118.80
Mosquito Remote RF keyfob
  • Mosquito Remote RF keyfob
  • Additional IR (infrared transmitter) key fob which can be used with Compound Security Systems' in-line remote control.
  • From £19.20
Mosquito Security Cage
  • Mosquito Security Cage
  • 2mm thick LASER cut folder stainless steel security cage
  • From £59.99
Mosquito Timer UK
  • Mosquito Timer UK
  • UK 13Amp 7 day digital plug-in timer for Mosquito MK4
  • From £14.00
Mosquito MK4 features
  • Teenage only setting: 17 KHz sound (only under 25's can hear)
  • All-age setting: 8 KHz sound (people of ANY age can hear)
  • 4 volume/distance settings (maximum volume 103 dB)
  • 35-40 metre maximum range (depending on ambient noise)
  • 4 on/off options: manually, PIR sensor, remote control or timer
  • Audible beep on/off
  • Low voltage operation: 1 hour installation (competent DIY person)
  • 20 minute run time (Continuous run time can be achieved by requesting a 'continuous chip'to be installed in the unit) All Mosquito units supplied with a timer will have a continuous chip installed automatically.

The results have been quite dramatic with youths vacating the area within minutes

We installed our first Mosquito in the Locksheath District Centre which is a shopping centre near Fareham.

They were suffering the usual problems of gatherings of large quantity of youths and the…

Tony Walters
Crime Prevention Officer, Hampshire Police Fareham Division

Feedback from Premier Security

This feedback was received from Premier Security who are a security company based in Belfast, Ireland, UK.

Pre-Sales Service: 5/5
Post-Sales Service: 4/5
Ease of use of the Product: 5/5

Premier Security

There has been positive feedback and enthusiasm from the stores

These second set of results show that the trial has been successful and there has been positive feedback and enthusiasm from the stores.

Midcounties Co-operative
Loss prevention trials

The impact that it has made is unbelievable

Dear Simon,

Please excuse me for not replying to you earlier but i have not been too good with a chronic pain problem.

We had the mosquito put up…

Kris Perkins
Private home owner

No further vandalism since the units were fitted

Approx £54K over a 12 month period preceding the installation. There have been a couple of further minor incidents of vandalism but not while the units where switched on and operational.


Gordon White
Building Surveyor, Plymouth City Council

We have had a positive reaction regarding its use from members of the public

Regarding the Mosquito apparatus that we have recently been using in our area, this is just a note to say that we have been extremely pleased with it.

We have also had…

Sarah Ward
PC 1623, Gloucestershire Constabulary

Since the unit has been installed we have seen a huge reduction in numbers gathering

Hello I recently bought a unit from I was very unsure about the product and all the press. The staff where very helpful and persuaded me that my initial concerns would be soon forgotten.…

M Patel
Shop Owner

In the two months after the device was introduced the police received just three callouts

A controversial mosquito device is to be introduced to deter trouble-making youngsters gathering near a Preston street.

Police and community leaders are hoping to erect the device, which works by emitting high…

We now live in peace and quiet, and feel as if our home is our own once more

Thank you so much for your wonderful invention - it has completely changed our lives in under a week. Our house is a corner house that gives directly onto the street, and we were constantly…

Annie Hawes

You can move crowds without getting into a confrontation

Already, the device has helped with youth crowd control at our school system in Columbia, S.C, emergency services manager at Richland School District Two, said that the schools purchased two Mosquitos from RMS Technologies two…

Rick McGee
Service Manager, Richmond School District Two, South Carolina

Youths are not congregating anymore

Evaluation of Trial Mosquito™ sited at CO-OP London Road, Macclesfield.

We were regularly called to the shop in relation to nuisance youths congregating, intimidating members of the public and "persuading" them to…

PCSO 7068 Simon Martindale
Macclesfield Neighbourhood Policing Unit, Cheshire Constabulary

The success of this initiative has been effective and noted by both this department

For 12 months to date your company has supplied and fitted a number of 'Mosquito Anti Social Behaviour Devices' in the Liverpool South Localities.

The success of this initiative has been effective…

Lawrence Jeffries
Crime Reduction/Architectural Liaison Officer - Merseyside Police

All the anti-social behavior problems ceased

As a beat officer working in Bournemouth I had to deal with the problem of underage drinking and antisocial behavior that regularly occurred at the rear of a community centre. We installed the mosquito system…

PC Mike May 2093
Beat Officer, Dorset Police, Bournemouth

Mandatory condition of a licensing application that a mosquito device be fitted to a shop

Hello, Please note that Sheffield City Council Licensing Board (of which I am a member) have on several occasions made it a mandatory condition of a licensing application that a mosquito device be fitted to…

John Robson
Councillor for Arbourthorne Ward - Sheffield City Council

Fantastic invention

It is excellent news that the mosquito has been a huge success story for the Co-operative Group and is having a significant impact in attacking the problem of crowds gathering around our stores.

Stefan Trbovic
Manager Sunwin Security

What an incredible invention. I would highly recommend it

I decided to purchase your Mosquito device because tenants of mine had been hounded by noisy, drunken and malicious youths for many years.

Your device took no more than 15 minutes to…

Jim Hourihan

Midcounties Co-operative Mosquito Trial Results

The results show that the trial has been successful and there has been positive feedback and enthusiasm from the stores. No negative feedback or complaints have been received by either store from members of the…

Kevin Brown
Group General Manager, Midcounties Co-operative

Idlewells Shopping Centre

Hi Simon,

I just wanted to drop you an email to let you know this [Mosquito] seems to have solved our problem – yippee!

Another property manager who works…

Ashdown Phillips Property management

I can’t thank you enough

Dear Si,

I bought the Mosquito from one of your resellers and i have had it fitted now. I can't thank you enough. It has made such a difference to my life.…

Mr. Burnside, Leeds

Thank you Simon, you have given us our lives back

Hi Simon

Steve Tayler here from 22 Wheatley road in Leicester. I Bought a couple of Mosquito units off you last year.

Soon after I began using the mosquitoes…

Steve Tayler, Leicester