UK Patent Pending · Particle Electronics
THIEVES ARE
TARGETING
YOUR CAR.
Now you can fight back.
JamFinder detects the radio frequency signals used in keyless relay and jamming attacks — and alerts you instantly, before your car is gone.
433 MHz · Detection Active
125 kHz · Detection Active
The Threat
Keyless theft is silent, fast, and almost impossible to detect.
Criminals use electronic devices to amplify your key's signal from inside your home — tricking your car into thinking the key is nearby. Others jam the locking signal so your car never locks at all. Both attacks happen in seconds. You never know until it's too late.
YOUR KEY
RELAY ATTACK
JAMFINDER
DETECTED
YOUR PHONE
JamFinder intercepts the attack signal and alerts you — in real time.
How It Works
Three steps. Seconds to respond.
Detects
JamFinder continuously monitors the 433MHz band — the frequency used by keyless entry systems. The moment a relay amplifier or jamming device activates nearby, it's captured.
Alerts
An 85dB siren fires immediately. Simultaneously, JamFinder sends an SMS text message and places a voice call to your phone — wherever you are in the house.
You Act
Open an upstairs window. Let the thieves know the police are on their way. They won't expect to be caught — this type of theft normally goes completely undetected.
Inside JamFinder
Engineered to detect. Built to last.
Custom colours available
3D-printed PLA enclosure — made to order
RF Filter Stage
ESP32 PICO · Wi-Fi Core
433.92 MHz · Field Testing
Dashboard Mount · In-Vehicle Detection
Capabilities
Everything you need. Nothing you don't.
433MHz Jamming Detection
Monitors the exact frequency band used by keyless entry systems — 433MHz with a 2MHz detection bandwidth.
Criminals use off-the-shelf relay amplifiers operating at this frequency. JamFinder is tuned to catch them the moment they activate within range.
DETECTION ACTIVE
Instant Multi-Channel Alerts
When an attack is detected, JamFinder doesn't wait. An 85dB siren fires immediately — and your phone rings.
SMS text messages and voice calls are sent to your registered mobile number. You're alerted whether you're asleep upstairs or in the back garden.
85dB Siren
Immediate local alarm
SMS Alert
Text to your mobile
Voice Call
Phone call alert
LED Strobe
Visual indicator
Compact. Discreet. Powerful.
At just 75 × 35 × 20mm and 40g, JamFinder fits anywhere — by the front door, on a windowsill, or magnetically mounted on your dashboard.
USB-C powered at 5V/80mA. Custom 3D-printed PLA enclosure available in your choice of colours. Provision and monitor via the Android app.
USB-C · 5V · 80mA
Placement Guide
Where to place your JamFinder
We recommend starting with one unit inside your property, near where your keys are kept. A second unit in the vehicle improves detection of key jamming attacks.
Recommended — Unit 1Inside Your Home
Front door or front-facing window
Thieves scan for your key signal from outside. Placing JamFinder near the front of your property gives maximum detection range against relay amplifiers.
Optional — Unit 2
In Your Vehicle
Dashboard — magnetic mount
A second unit in the car detects jamming attacks that prevent your car from locking. Catches a different class of attack that the home unit may miss.
Technical Specification
433MHz · 125kHz · SMS / Call / 85dB · USB-C · 40g
13 parameters. Every value documented.
In The News
Don't just take our word for it — here's what the press say about keyless car theft.
All articles © BBC News. Links open on bbc.co.uk.
Compatibility
Will it work for me?
If your car has Passive Keyless Entry (PKE), yes.
This means a system where you can approach the vehicle and — provided you have the key in your pocket — pull the car door handle and it will open. You do not need to physically press any buttons on the key fob. Typically you can also press the Start button without using the fob at all.
Not sure if your car has PKE?
Try a Google search like this — substituting your own vehicle details:
Tip: MY means model year — so MY18 = a 2018 model.
Order Now
Protect your vehicle
tonight.
JamFinder ships ready to use. Plug in, provision via the Android app, and your home is protected within minutes.