rozzrReserve

Make way,
earlier.

Rozzr hears emergency-service radios nearby and warns you early, so you can make way in good time.

Reserve yoursHow it works

Light. Voice.
Screen.

Three warnings at once, so you notice whatever you’re doing.

  1. Visualisation: close-up of a Rozzr's corner on wet asphalt, its blue light line glowing and reflected in the water

    Visualisation

    Light

    A blue line that grows with the signal, in five steps. Dims itself at night.

  2. “Emergency radio nearby. Getting closer.”

    Voice

    A short spoken alert. Double-tap the device to mute it.

  3. A Rozzr Base screen reading 'Closing, 2 radios nearby' with four of five strength bars lit

    Screen

    How strong, how many radios, and whether it’s closing or moving away. Base and Pro.

Hears.
Never listens.

Ambulance, fire and police crews carry digital radios that transmit between 380 and 385 MHz. Rozzr watches that band and measures how strong nearby transmissions are. It never decodes, records or plays a single word.

  1. Watches

    A receiver tuned to 380–385 MHz, the band emergency crews' radios transmit on.

  2. Measures

    Strength in five steps, how many radios (1, 2 or 3+), closing or moving away.

  3. Warns

    Light and voice, plus the screen on Base and Pro.

No reports from other drivers. No account. No subscription.

Pick your size.

Visualisation: a Rozzr Base clipped to a car's air vent at night, its screen reading 'Closing, 2 radios nearby', blue emergency lights blurred through the rainy windscreen

Visualisation from the CAD. No unit has been built yet.

Made to be ignored. Until it matters.

Magnetic vent mount
Clicks on, lifts off.
USB-C power
No battery to cook in a hot car.
MODE button
Sound on or off, and sensitivity.
Double tap
Mutes the alert that's playing.
Auto-dimming
Bright by day, gentle at night.
Bluetooth
Ready for the app that's coming.

Designed.
Not built yet.

The circuit, firmware and case are designed and simulated. The first test units come next. We haven’t measured range yet, and we won’t quote one until we have.

Reserve yours.

No payment. We'll email you when it's ready, and only about Rozzr.

Which model?

Expected prices: Mini £79, Base £149, Pro £329. We’ll only email you about Rozzr, and we’ll delete your address whenever you ask. Privacy

Fair
questions.

Is this for avoiding the police?

No. It's made to help you make way for ambulances, fire engines and police on a call. Drive to the road and the limit; Rozzr just gives you more notice.

Does it listen to police radio?

No. It measures how strong the radio signal is between 380 and 385 MHz, and nothing else. It never decodes, records or plays any message.

Will it warn me about every emergency vehicle?

No, and nothing could. It can only notice a radio that is transmitting nearby, and crews don't transmit all the time. Treat it as an extra early warning and keep using your eyes, ears and mirrors.

What range does it have?

We don't know yet, so we won't guess. It depends on the radio, the terrain, buildings and your car. We'll publish what we measure once test units are on the road.

Do I need a phone or a subscription?

No. Rozzr works on its own from the car's USB socket, with no account and no subscription. A phone app for settings and history is planned, and it will be optional.

How is it powered?

From a USB-C cable to the car's USB socket. There's no battery, so nothing to swell in a hot car. The Pro is wired in.

When can I buy one?

Not yet: Rozzr isn't on sale. Reserve one and we'll email you when it is. We don't take any payment until then.