1) no distant signal; described with reference to its application.

2) distant signal; Analyzing method: the antenna all the way out， moving hand-held detectors， vibration， light， or voice prompts， adjust the antenna until the remaining length of an antenna (emission source detection sensitivity and the distance from the antenna length related)， as in the space of two or more， a distance of 3 meters or more positions have the same prompt， and closer to the window， the more obvious the vibration， you can confirm that the signal from afar. In such an environment， V120 applications as follows:

1) The antenna is fully recovered， then prompts detector confined to within 50 cm of the emission source prompt， and automatically clear interference distant signal， retract the antenna handheld probe， in which the most vulnerable space and hidden cameras hearing of the site， close to the motion detection， it can ensure safety.

2) In such a space alien signal distribution， beware of foreign personnel， goods， please call to the vibration profile， in your pocket， in or near the foreign staff walked past articles， you can use vibration perception.

3) the strict distinction between the phone and other signals is the biggest feature of this machine. When the user is used to prevent inappropriate cell phone use while without moving， as long as the probe is on， that is light (vibration file) or light + voice prompts.

A situation that the user reaches the non-recurring， uncertainty places and spaces， hotel rooms， karaoke bars or massage parlors， consumer sites， tea meetings and other places. Because no chance to do a background detection， proper use of the user as needed.

1) If the concern conversation leaked through mobile terminals， open only one device antenna length， namely the absence of flashing lights showed no phone in working condition or not in accordance with the GSM network technology， environmental monitoring equipment.

2) If the room or massage room and other places have the time， space to complete a fixed place， follow a fixed place of use.

3) If there is no prevention normed space and time， under no antenna (antenna fully retracted) conditions in and around the talks table for staff to move around a week if vibrating alert， indicating a wireless listening device or work， to ensure safety ， set aside an antenna， according to the above process was repeated once again， if prompted， the user to change the meeting room.