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EST-101K mobile phone standby signal detection use the most advanced RF technology to solve the mobile phone monitoring issue under standby and mute mode. This scanner can quickly get the mobile phone status in standby with 1-10 meters shiedling radius (about 10-100 square meters), no matter it is in power on, power off or in calling. And it can tell you which carrier the mobile phone use (GSM \ CDMA \ 3G \ 4G) and show the corresponding message in the screen, but will not interfere with other electronic equipment, to make sure its safety of the required places. It uses Passive Receiving Signal Zero Transmission Power, no harm to human body, we are the only domestic mobile phone standby detector manufacturer.