La Clé du 16 installs wireless Ajax alarms in flats, houses and shops across Paris. No compulsory subscription, run from your phone, fitted and set up by a locksmith.
In 2022, the police recorded 8.7 burglaries or attempted burglaries per 1,000 homes in Paris, against a national average of 5.8. An alarm does not replace a good door: it detects the break-in, makes noise and warns you wherever you are.
Burglaries or attempts per 1,000 homes, 2022
Source: Insee Flash Île-de-France no. 80, May 2023, French Ministry of the Interior data (SSMSI).
Every installation starts from the same base, completed to suit your rooms and entrances. The devices talk over encrypted radio: no chasing walls, no visible cables.
The brain of the system. It connects to your router by Ethernet cable and takes up to two SIM cards as backup. Up to 100 devices and 50 users.
Fitted on the front door and reachable windows, it reports any opening. Its battery is designed to last up to 7 years.
It detects movement up to 12 m away and ignores pets under 20 kg and 50 cm. When the alarm goes off it takes a series of photos: you see what is happening before you react.
Adjustable from 80 to 100 dB at one metre: enough to make an intruder give up and to alert the neighbours.
By the entrance, to arm and disarm with a code. A duress code appears to disarm the system while sending a silent alert.
For a house or a shop: 85 to 113 dB, IP54 casing, and an alarm if anyone tries to tear it off.
And depending on the place
With the KeyPad TouchScreen and its 5-inch touch screen, you disarm with a code, a Tag key fob, a Pass card or your phone.
Smoke, heat and, depending on the model, carbon monoxide. All the detectors sound together and the app warns you even when you are away. Compliant with EN 14604.
Placed on the floor under the washing machine, the water heater or the sink, it alerts you as soon as water reaches it.
We also install IP cameras, indoors and outdoors. With Ajax cameras, live images and recordings are viewed in the same app as the alarm.
Yes, provided the radio link is monitored at all times. That is the job of Ajax’s Jeweller protocol: each detector talks to the control panel in both directions over an encrypted link, and the panel regularly checks that it is still there.
When the alarm goes off, the MotionCam detector sends a series of photos to your phone, in under 10 seconds with the default settings. You know at once whether it is a relative who forgot to disarm or a stranger. It only takes photos when there is an alarm.
The link hops between frequencies and the control panel reports any jamming attempt. Each device also raises an alert if it is opened or torn off its mount.
Manufacturer’s figures, taken from its technical data sheets on 11 November 2026.
We think in lines of protection: the surroundings, the entrances to the building, then the rooms where the valuables are.
In a flat, everything hinges on the front door: an opening detector on the door, a photo motion detector in the hallway, a siren and a keypad. On the ground floor, the first floor and the top two floors the windows can be reached: we equip them too. Everything stays inside the flat, without touching the shared areas of the building.
A house is protected from the outside in: outdoor photo detectors on the garden and the approaches, opening detectors on ground-floor doors and windows, motion detectors on every level, an outdoor siren. A site visit is essential to set the outdoor detectors.
Shop window, stockroom, till: a keypad at the entrance is essential. Each employee has a personal code, and the log shows who armed or disarmed, and when. A discreet panic button can be placed under the counter. The metal shutter and the door lock complete the set-up.
Answer a few questions and the list updates. It is a guide only; we confirm it during the free survey.
Free survey and quote, answered within 2 hours on average
Both are possible with the same equipment, and you can change your mind later.
The siren goes off and the app warns the people you have chosen, with the detector’s photos as evidence. With self-monitoring, no monthly fee is owed to the manufacturer. Just allow for a SIM card if you want mobile-network backup.
The system can be linked to a monitoring centre, which handles the alarm day and night under the terms of your contract. Monthly fees then apply. It is useful if you are often unreachable, or if your insurer requires it: tell us when you ask for the quote.
The price depends on the place, not on a package: number of entrances to protect, number of rooms and levels, any outdoor area, and fire, water-leak or camera options.
Send photos of the entrance and rooms, or a floor plan: we suggest a first set-up and a price before we come. The price including VAT is given before you order.
The quote includes
An alarm detects, makes noise and warns you. It does not hold anyone back. What makes a burglar give up is time: a door and a lock that hold while the siren is screaming. La Clé du 16 is first and foremost a locksmith: we look at your door before we talk about detectors.
A free survey, a clear quote, fitting in a single visit and a handover with you.
On site, or from photos and floor plans. We note the entrances, the rooms, your habits and any pets, then draw up the protection plan with you.
Each device clips onto its mount, screwed to the wall. No cables to run between detectors: no trenches, no repainting.
We measure each detector’s radio signal, check its detection zone, set the entry and exit delays, then trigger the sirens.
We create your app access, your codes and those of your family, and show you the everyday steps: arming when you leave, night mode, what to do when an alert comes in.
And afterwards? We stay reachable: adding a detector, changing batteries, moving the system to a new home.
Inside your home you are free to install an alarm. As soon as a device touches the façade or the shared areas, such as an outdoor siren or a camera on the landing, you need the agreement of the co-owners. In a flat we therefore plan a system that stays entirely indoors.
A private individual may only film the inside of their own property: not the street, not the neighbours. If someone works in your home, such as a childminder or a home help, they must be told that cameras are present. These rules are set out by the CNIL, the French data protection authority.
Some policies require NF&A2P-certified equipment or an APSAD-certified installer, especially for shops and valuables. Ajax’s Baseline range meets EN 50131 Grade 2; products in its Superior range are NF&A2P certified. Send us the clause of your policy before the quote: it guides the choice of equipment.
Another question? Call or message us.
The price depends on the number of entrances to protect, the number of rooms and levels, and the options you choose: outdoor area, fire, water leak, cameras. There is no package price: after a survey on site or from photos, you receive a free quote, itemised device by device, fitting and set-up included. The price including VAT is given before you order.
Yes. With self-monitoring, the Ajax alarm works with no monthly fees: the siren goes off and the app warns the people you have chosen. Monthly fees only apply if you link the system to a monitoring centre.
No: a wireless alarm is fitted without trenches or cables between devices. Fitting is done in a single visit.
Yes. Without the internet, the detectors and sirens keep working: if someone breaks in, the alarm sounds. To be warned on your phone, the control panel needs a connection: your router, by Ethernet cable, or a SIM card. In a home with no router, a SIM card with a data plan is enough.
Yes. Inside your home, no permission from the co-owners is needed as long as nothing is fixed to the façade or in the shared areas. The devices are wireless and held by a few screws: if you rent, tell your landlord, and take the system with you when you move.
The Hub 2 (4G) control panel switches to its backup battery, which lasts up to 15 hours, and communicates over its SIM card. The detectors run on batteries: up to 7 years for an opening detector, up to 4 years for a photo motion detector. The app tells you about the power cut.
The motion detectors we fit ignore pets under 20 kg and 50 cm, provided they are fixed at the right height and properly set. For a large dog, we protect the entrances with opening detectors instead and keep motion detectors for the rooms it does not enter.
A subscription alarm ties the equipment to a monthly monitoring contract. With Ajax, you buy the equipment, fitted by an installer, and then you choose: self-monitoring with no monthly fees, or a monitoring contract if you need one.
The landing is part of the shared areas: you need the agreement of the co-owners. A camera may film the inside of your home or premises, not the public highway or the neighbours.
It depends on your policy. Some insurers ask for NF&A2P-certified equipment or an APSAD-certified installer, especially for shops. Control panels in Ajax’s Baseline range meet EN 50131 Grade 2; products in the Superior range are NF&A2P certified. Send us the clause of your policy: we tell you what is suitable before the quote.
In all 20 arrondissements of Paris, from the 1st to the 20th, and in Hauts-de-Seine: Boulogne-Billancourt, Neuilly-sur-Seine, Levallois-Perret, Issy-les-Moulineaux, Courbevoie and the neighbouring towns.
Our technicians set out from the 16th arrondissement and install across Paris, from Paris 1 to Paris 20, and in Hauts-de-Seine. Tell us the place, the number of rooms and entrances: the survey and quote are free, with a reply within 2 hours on average.
