Hidden cameras are everywhere nowadays. Travelers especially need to be wary in rented rooms. A WikiHow article shows how to find one using your smartphone.
Note the red dot in the blackness above (from a hidden camera) is not visible light - you could see that with your naked eye. This is infrared light from the spy camera, detected by the front-facing camera on your phone.
More procedural details at the link.
most digital cameras will detect IR emitters - just view the scene using the camera display and you can see the bright spot. an easy way to check if the remote control is working is to view the remote's window using your digital camera display and pres some remote buttons - you should see lights in the remote's window.
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