A basic pir motion detector will detect movement from just about 1-2 feet away. This will ensure that whatever is triggering the device is close to it and not movement from an investigator in another room.
Works in light or dark locations.
 
It will then begin playing a nice music box song that alerts you to motion in the intended area of investigation. Length of music is about 15 seconds for each trigger.
 
Uses 3 x AA Batteries (included), On/Off switch, simple to use.