Sentry Detect - Emergency Vehicle Awareness System | TETRA Airwave Detector
Know what’s around you. Before you see it.
Sentry Detect passively monitors the UK Airwave TETRA network - the secure digital radio system used by every police car, ambulance, and fire engine in the country. When an emergency vehicle is within range, Sentry alerts you instantly. Even unmarked vehicles. Even when there are no lights or sirens.
All at a quarter of the price of the competition.
How It Works
Every emergency service vehicle continuously transmits short periodic signals over the Airwave network - whether or not the officer is talking, and whether or not the vehicle is marked. Sentry Detect passively listens for these signals and alerts you the moment they’re detected nearby.
Sentry does not decode any communications, jam any signals, or transmit anything whatsoever. It is entirely passive and completely legal throughout the UK and Europe.
What Makes Sentry Different
Most emergency vehicle detectors do one thing - detect TETRA signals. Sentry does significantly more:
• Detects marked and unmarked police, ambulance, and fire vehicles
• Dual antenna detection with left/right directional indication - know which side the vehicle is approaching from
• Real time signal strength display - watch proximity increase as a vehicle approaches
• Integrated GPS speed camera alerts - fixed cameras, mobile units, and average speed zones
• Average speed zone tracking - live display of required average speed to stay legal through SPECS zones
• Waze integration - community reported police and hazards overlaid on your alerts
• Free firmware updates forever - your Sentry gets better over time
• Self install in minutes - clips to your mirror, no professional installation required
• Works in every car including EVs and vehicles with coated windscreens
• Lifetime warranty - if it ever fails we replace it, no questions asked
What’s In The Box
• Sentry Detect unit
• Mirror mount clip - fits virtually all vehicles
• Short antenna - for immediate use
• Extended antenna - for maximum range
• USB-C power cable
• Hardwire kit - fuse tap for clean permanent install powered by ignition
• Install guide
Technical Specification
• Detection frequency: 380-400MHz UK Airwave TETRA band
• Display: 1.9” IPS LCD - bright, wide viewing angle, no burn-in
• GPS: Integrated - speed cameras, average speed zones, location aware sensitivity
• Power: USB-C - cigarette lighter adapter or hardwire to ACC
• Connectivity: Wireless unit pairing for Duo mode
• Updates: OTA firmware updates via WiFi
• Operating temperature: -20°C to +70°C
• Dimensions: 90mm × 35mm × 15mm
• Colour: Matte blacK
Is It Legal?
Yes. Sentry Detect is completely passive - it only receives signals and never transmits, decodes, or interferes with anything. It is legal to own and use throughout the UK and Europe. Sentry is an awareness tool, not an enforcement avoidance device.
Lifetime Warranty. Free Updates. 30 Day Returns.
Every Sentry Detect comes with a lifetime warranty against manufacturing defects, free firmware updates forever, and a no-questions-asked 30 day money back guarantee. If it doesn’t work for you, send it back. Simple.