Detects emergency vehicles
Picks up the radio of police and emergency vehicles near you — even unmarked ones.
Police detector for Android
Tetra Hunter
Your Android phone alerts you to nearby emergency-service radio signals. Clear beeps. A simple strength bar. No subscription.
App licence from €29.99. Android phone, USB receiver and antenna required separately. See the complete setup.
- 10-minute setup
- Works offline
- No subscription
Try the app right here
Tap the buttons, scroll and open Settings — it’s live.
Tetra Hunter
Stopped
Rotate phone for fullscreen.
RX1
380.000 - 382.500 MHz● Idle
Status: stopped | margin 12 - 33 dB | IQ --
RX2
382.500 - 385.000 MHz● Idle
Status: stopped | margin 12 - 33 dB | IQ --
RX1 FLOOR--
RX2 FLOOR--
MODECITY
Spectrum / waterfall
No receiver connected
Debug
RX1
Waiting for RX1 diagnostics
RX2
Waiting for RX2 diagnostics
System
Waiting for system diagnostics
Detector Main Settings
City mode thresholds
Alarm sound outputBluetooth uses connected audio; otherwise phone.
Advanced Detector Settings
If you get false positives, talk with Letoa93 on Discord before touching receiver gain.
Blacklist list filePermanent muted MHz lines.
RTL-SDR Devices
Max span: 2.56 MHz per receiver.
General settings
RGB 255, 0, 0
Accent color.
Tetra Hunter colors are entirely customizable
RGB 255, 0, 0
Police alerts in real time
Unmarked cars too
App licence from €29.99
No subscription
Watch
Watch it in action.
See the setup and hear the alerts in use. Range varies with equipment and surroundings.
How it works
Three steps. Zero hassle.
- 1
Plug in
Connect the small USB receiver to your phone.
- 2
Activate
Enter the licence code you get when you buy.
- 3
Drive
Press Start. Your phone beeps when the police are close.
Try it
Green. Orange. Red.
More lights mean a stronger received signal, not an exact distance.
- Green — weaker signal
- Orange — medium signal
- Red — stronger signal
Demo. Real range depends on where you drive.
Green — weaker signal
Features
Everything you need. Nothing you don’t.
Screen off? Still on.
Keeps watching with your screen off, so you can use GPS or music.
Just listen
Different beeps for green, orange and red. Eyes stay on the road.
City & Highway
Two modes, one tap. Tuned for town or motorway.
Works offline
No mobile data needed while you drive.
No advertising
No advertising cookies. Licence and security checks still use the licence server.
vs Target Blu Eye
Compare the complete setup, not just the licence.
Tetra Hunter uses your phone and separately purchased radio equipment. A dedicated detector is a different purchase.
TetraHunterTarget Blu Eye
Price€29.99 – €89.99 + equipmentHardware + installation
InstallPhone + receiver + antennaDepends on model
Switch carsTake your setupDepends on installation
Compare current equipment and installation costs, not just licence prices.
What you need
Your phone + a small USB receiver.
You probably already have the phone. The full kit, lifetime licence included: about €300.
1
An Android phone
Android 8 or newer. iPhone is not supported.
Already yours2
A USB receiver
Get the RTL-SDR Blog V3 (the V4 works too). Two receivers cover the whole band.
V3 or V43
An antenna
A small one inside the car, or a roof antenna for the best range — up to 1,000 m.
Inside or roofPricing
Pick your plan
Pay once. No subscription.
6 months
Try it out.
€29.99
≈ €5.00 / month
- Police alerts
- Green / orange / red bar
- All updates
- Starts when you activate
Most popular
1 year
Best price per month.
€49.99
≈ €4.17 / month
- Police alerts
- Green / orange / red bar
- All updates
- Starts when you activate
Best deal
Lifetime
Pay once. Done forever.
€89.99
Pay once, keep it forever
- Police alerts
- Green / orange / red bar
- All future updates
- Never expires
One payment. No subscription. Your plan only starts when you activate it.
FAQ
Questions?
What does TetraHunter do?
It turns your Android phone into a police detector. When a police car (or ambulance, or fire truck) is near, your phone beeps and a bar goes from green to red.
Can I listen to the police?
No. It only notices that a police radio is on nearby. It doesn’t listen to anything.
How far does it reach?
A few streets in town, much further on open roads. A roof antenna gives the best range.
Does it work on iPhone?
No, Android only (Android 8 or newer).
What do I need?
Your Android phone (Android 8 or newer), an RTL-SDR Blog V3 receiver (the V4 works too) and an antenna. The full shopping list is in the setup guide.
How do I get it?
Pick a plan on the pricing page and pay securely with Stripe. You then receive your licence code, your ID and the download link by email.
Ready?
Get nearby radio alerts.
Set up in 10 minutes. From €29.99.