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  Grennen R1 · In development

Check the room.
Then unpack.

Point it at the room. Hidden lenses glow.

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Grennen R1 from a low angle, standing on a light surface
R1 · Concept renderOne handheld. One guided room check.

Know your room.

R1

In development

The first thing you do in a new room.

A handheld for checking a hotel room or rental for hidden cameras.

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Coming later

In the works

A second product is in the works. Join the waitlist to hear about it first.

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Small enough to pack. Simple enough to use.

One hand · One big button · One screen

Close-up of R1 at an angle: the red button, two small keys, the grennen mark, the seam around the body and the raised grip
  1. A little bigger than a hotel keycard.22–35 mm deep, made for one hand.
  2. One button, one screen.A large red button and two small keys. Designed to walk you through the room, step by step.
  3. Plain words. Never a verdict.The screen gives a clear picture of where it is.
  4. Nothing to install.Designed to work on its own, with nothing to install, pair or sign up for.
  5. Private by design.Designed so nothing you scan is saved or sent anywhere.
  6. Quiet.Silent by default, with no alarms.
  7. Charges from your cable.Charge it from the cable you already travel with.

Design targets for the R1 concept. Features are in development, and details may change.

R1 from the front, at a slight angle
AThe face: screen, button and keys.
The back of Grennen R1: a small lens inside a ring of lights, on a square panel beside the grip
BThe back: the lens and its ring of lights.
The back of R1 at an angle, showing the lens panel and the raised grip
CThe back, at an angle.
Close-up of the R1 controls: the red button, two keys and the screen
DThe controls, close up.
Grennen R1 from above, showing the top edge and the raised grip
EThe raised grip, from above.
R1 in profile, showing its depth
FIn profile.
Grennen R1 from the front: a screen, a large red button and two small keys
GStraight on.

A stud finder for hidden cameras.

Lenses bounce light straight back. R1 makes them glow.

A real lens stays bright. R1 looks for lenses, whether or not a camera transmits.

Close-up of the back of R1: a small lens in the centre of a ring of eight lights

We test before we sell.

As of October 2026

  1. DoneSchematic checked
  2. DoneFirst firmware written
  3. NowPrototype parts arriving
  4. NextBlind test

Our stop rule

If it can’t beat a $20 lens viewer when someone else hides the cameras, we change course.

Every room deserves a second look.

Join the waitlist for progress updates and the first chance at a unit. We take no pre-orders or payments until units are ready.

For ages 13 and up. Email only: no payments, no spam, and you can leave any time. Privacy