In 2025, Chinese police handled more than 12,000 hotel spy-camera cases nationwide. From budget chain hotels to boutique homestays, hidden cameras turn up everywhere: smoke alarms, power outlets, TV bezels, air-conditioner vents, even bathroom hooks. The footage is often uploaded to illegal sites or streamed live — victims may be watched by thousands without ever knowing.
You probably don't carry a professional bug detector when you travel. But the phone in your pocket is the most convenient detection tool you own. Here are six practical checks, plus what to do if you actually find one.
1. The infrared scan: turn the lights off
Almost all miniature spy cameras have infrared night vision so they can keep recording in the dark. That very feature is the giveaway.
How to do it:
- Close the curtains, turn off every light, and let your eyes adjust for a minute or two.
- Open your phone's camera app. On iPhones, use the front (FaceTime) camera — the rear lens often has an IR filter and can't see the light.
- Set the screen brightness to maximum and slowly sweep the room.
- Look for a purple or white dot that is invisible to the naked eye — that's the IR emitter glowing.
The 30-second self-test: not every phone can see IR. Point a TV remote at your front camera and press a button. If you see a small purple or white dot on screen, that camera sees IR. If not, try the rear camera — filters vary by model, so testing beats guessing.
850nm vs 940nm: why some cameras stay "invisible"
Night-vision cameras use IR LED illumination at two common wavelengths:
- 850nm — emits a faint red glow, visible in the dark with the naked eye, easy for phone cameras to catch.
- 940nm — emits almost no visible light; some front cameras pick up only a weak dot, many see nothing.
And a third type — "low-light" cameras — uses highly sensitive sensors instead of IR at all. They have no IR glow, but their lenses still reflect light. So: a clean dark-room sweep does not prove the room is clean. Combine this method with checks 3 and 5.
Where night-vision cameras hide: they need to "see" the bed or bathroom, so focus on objects facing those directions with steady power: smoke alarms, bedside alarm clocks, routers, TV bezels, AC vents, lamp bases, outlets and chargers, bathroom hooks. High position, good view, reliable power — that's the pattern.
2. Wi-Fi device scanning
Most modern spy cameras stream video over Wi-Fi, which means they must join a network. Your phone can scan for them.
How to do it:
- Install a network scanner (Fing or similar).
- Connect to the room's Wi-Fi — or turn on your phone's hotspot and watch what connects to it; some cameras auto-join open hotspots.
- Run a scan and look at the device list.
- Watch for names containing "Camera", "IP Camera", "CMOS", "Lens" — or anonymous devices from small electronics manufacturers.
If you find a suspicious device you can't identify, disconnect devices one by one: your TV or router going offline is obvious to you, a hidden camera won't be missed by anyone.
3. Lens reflection with a flashlight
Every camera lens has one physical property: it reflects light. This check works with the lights on.
How to do it:
- Turn on your phone's flashlight (steady mode).
- Hold it next to your eye, shining in your line of sight.
- Sweep slowly across every suspicious spot.
- A pinpoint blue or white reflection is very likely a lens.
A tissue over the flashlight softens the beam and makes faint reflections easier to spot. Start from the direction facing the bed — the most common camera angle.
4. The flash-photo upgrade
Take the previous method one step further with your camera:
- In a dim room, photograph suspicious areas with the rear camera and flash on.
- Don't look at the viewfinder — check the finished photos, zoomed in.
- A lens reflection shows up as a very bright, fixed point. Shoot the same spot from several angles; if the bright point stays put, that's highly suspicious.
This method also produces evidence. But note: evidence photos themselves are sensitive — see the last section on where to keep them.
5. The physical checklist
Technology aside, basic physical inspection matters. The most common disguises:
| Object | Why it's suspicious | How to check |
|---|---|---|
| Smoke alarm | Faces the bed, wired power, hollow | Look for unusual pinholes or LEDs |
| Outlet / charger | Natural power, faces the bed | Check for a tiny lens hole |
| TV / set-top box | Faces the bed, plenty of space | Inspect bezels and indicator areas |
| AC vent | High vantage point, hard to notice | Shine a light inside |
| Bathroom hook / hanger | Private area | Check the back for holes |
| Lamp / alarm clock | Right by the bed | Inspect base and dial |
| Router | Network and power ready | Look for extra lens holes |
| Plants / decorations | Easy to hide | Check leaves and pots for pinholes |
One simple rule: any object facing the bed or bathroom with a small hole you can't explain deserves suspicion.
6. If you find one: the right order of actions
Your first instinct may be to rip it out or confront the front desk. Both can put you on the back foot. Do this instead:
- Don't touch it. Fingerprints on the device are key evidence.
- Photograph and film everything — position, appearance, LED status, from multiple angles. Keep evidence photos out of your system camera roll (see below).
- Check for a memory card. Some cameras store locally on SD — direct evidence.
- Call the police (110 in China). Don't go to the hotel first; staff may destroy evidence before the police arrive.
- Keep your booking records — confirmation, room number, check-in time.
- Demand a solution after the police are involved; you have the right to compensation.
Under China's Public Security Administration Punishments Law (Article 42), secretly filming others' privacy carries detention of up to 5 days or a fine of up to ¥500; aggravated cases, up to 10 days. If the footage is distributed, criminal law may apply.
Why your evidence photos need a private vault
In the stressful moment of discovery, you'll instinctively pull out your phone to photograph the camera. But if those photos sit in your camera roll, three things can go wrong: hotel staff may ask to "verify" by looking through your phone; cloud backup may sync the evidence somewhere you don't control; and a moment of sharing "to warn everyone" can leak the evidence itself.
The safer habit: put evidence shots straight into an app sandbox where the system photo library never sees them. That's what SheMi is built for — photos taken inside the app never touch the camera roll, iCloud, or any chat app. Learn more about SheMi.
Summary
Hidden cameras aren't disappearing, but six phone-based checks give you a solid safety margin: the dark-room IR scan, Wi-Fi device scanning, flashlight reflection, flash photography, the physical checklist, and the right response sequence. If you travel often, bookmark this guide and run through it on check-in. Five minutes of checking beats becoming the next victim.