How to detect a hidden camera in a hotel room

Hidden camera stories in hotel rooms make headlines every year, from small guesthouses to well-known international chains. The question every traveler asks is the same: can you actually check for one yourself, without hiring a counter-surveillance specialist? Yes, with a structured method that takes under five minutes.

Carrying a hidden camera detector like Sonar makes this kind of check a lot faster, especially if you travel often.

Why hotel rooms are a common target

Hotels have high guest turnover, standardized room layouts (making it easy to reuse hiding spots already tested in other rooms of the same property), and in some cases staff or previous guests with brief access to the room’s wiring. Real police investigations show a clear pattern: most cameras are hidden inside objects that already exist in the room, rarely installed out in the open from scratch.

The objects most often used to hide cameras

• Digital alarm clocks facing the bed: the classic of classics, since the display already works as a window and they’re plugged in around the clock.
• Ceiling smoke detectors, which offer a wide view of the entire room.
• USB chargers and outlet adapters already plugged in, since they look harmless and are rarely questioned.
• Wall hooks and hangers, especially near the closet or bathroom entrance.
• Picture frames and decorative mirrors, especially ones facing the bed or the changing area.

Checklist when you arrive

1. Before you unpack, do a quick walk-through of the room, paying extra attention to objects listed above that face the bed.
2. Turn off every light and close the curtains, making the room as dark as possible.
3. Hold your phone at eye level, turn on the flashlight, and rotate slowly through 360°, scanning each object from different distances.
4. Look for the telltale glint of a lens: a small, bright, steady point of light, similar to the “cat’s eye” glow you see in animal photos taken in the dark. The glint “follows” the flashlight as it moves.
5. Never use a USB charger already in the room. Bring your own and unplug whatever you find.
6. Run your hand along closet corners, behind picture frames, and under tables, feeling for small holes, mismatched screws, or slightly loose panels.

The flashlight trick, explained

Camera lenses are made of polished, curved glass specifically shaped to focus light, and no other common surface in the room reflects light quite that way. When flashlight beams hit a lens directly, the reflection concentrates into a tiny point, often with a faint colored “ring” around it. Polished metal, watch faces, and jewelry can look similar at first glance, but they never produce that same sharp, steady glow.

Signs that deserve a second look

Wires that don’t seem to lead anywhere, objects that look “too new” for an otherwise standard hotel room (an unusually branded alarm clock in a hotel that normally wouldn’t supply one), or small details that are slightly off, like a crooked outlet or a smoke detector sitting a bit off-center on the ceiling, are worth a closer inspection.

Frequently asked questions

Is it worth checking every hotel, even well-known chains?

Yes. Hidden cameras in hotels are usually not installed by management, but by third parties with brief access to the room, something that can happen in any category of hotel, regardless of brand.

How long does this check actually take?

Three to five minutes, following the checklist above, is enough to cover the room’s highest-risk spots.

Let technology do the heavy lifting

Doing this sweep manually, item by item, does work, but it’s easy to miss a corner or mistake a random reflection for a real lens. That’s exactly what Sonar is built for: the app combines your phone’s camera with its magnetic sensor to scan the room systematically, flagging both suspicious lens glints and spots with unusual magnetic concentration (common in cameras mounted with a magnet behind frames or mirrors). All the processing happens on your own device, so no image of your room is ever sent to a server.

What to do if you find something suspicious

Don’t touch or remove the object. Photograph it, alert the front desk immediately, and if the suspicion is confirmed, file a police report. Reputable hotels treat this kind of report as a priority, since the property’s reputation is directly on the line.

Related reads

• How to tell if there's a hidden camera in an Airbnb
• Signs of a hidden camera: full checklist