The detecting distance will be varied depending on the type and output power of signal sources.
Applications:
1. Examination (avoid any leakage of the exam)
2. Hotels (Protect personal privacy)
3. Dressing room of the mall( Avoid any spy camera inside)
4. Boss or leader’s office (Avoid any loss information of important meeting)
5. Meeting rooms (Protect the information of the meeting)
6 .Police use it to spy the suspects
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