Here is a tool that lets you detect cell phones and create noise to prevent people from listening to your private conversations. Its cell phone detector can indicate illegal activation of a phone. You can also create interference in your area to suppress the microphone in unauthorized phone.
The device warns you with the help of LEDs. It offers accurate and sensitive detection of GSM 900/1800, CDMA850, WCDMA2100. The battery can last up to 15 days. Not cheap but useful to have for those private conversations.
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