When the red light emitted by the detector reflects off a camera lens, a bright point appears at the center, allowing the user to identify the location of the camera. The device can also detect electromagnetic waves emitted by cameras, making it possible to locate hidden devices even when they are concealed. With incidents of voyeuristic filming in schools increasing nationwide, and similar cases occurring in Mito, the city has begun distributing one detector to each municipal elementary school, junior high school, and compulsory education school starting March 17th. Officials hope the move will help deter hidden-camera crimes within school facilities.