How Do I Choose the Best Invisible Headphones?

The communication method between the invisible earphone sensor and the earphone is magnetic induction communication. The earphone itself does not have the problem of being shielded or detected. The shielding or detection mainly occurs on the communication equipment connected to the earphone. The basic configuration that is popular among users now is invisible earphones with mobile phones, so it is mainly mobile phones that are shielded or detected. At present, mobile phone shielding systems on the market are mainly for the three frequency ranges of GSM900MHz, GSM1800MHz, and CDMA2000MHz. The detection range of dogs is generally 100MHz to 2600MHz. The working frequency of anti-shielding anti-detection transmitter is 200 400MHz (the working frequency of anti-shielding anti-detection transmitter has been extended to 75 ~ 600MHz), so the mobile phone shielding system is invalid for this device.

1. Invisible earphones also known as deep ear canal (external ear canal) miniature wireless earphones, invisible earphones, meters

The invisible earphone is a miniature wireless earphone, which can be divided into the following two categories according to its appearance size and performance:

Product Features * Small size, light weight, easy to use concealed. * Combined with ergonomic design

The communication method between the wireless sensor and the headset is magnetic induction communication. The headset itself does not have the problem of being shielded or detected. The shielding or detection mainly occurs on the communication equipment connected to the headset. The basic configuration that is popular among users now is equipped with mobile phones, so it is mainly mobile phones that are shielded or detected. At present, mobile phone shielding systems on the market mainly target three frequency ranges: GSM900MHz, GSM1800MHz, and CDMA2000MHz. The detection range is generally from 100MHz to 2600MHz. The anti-detection and anti-shielding wireless transmitter works at 200 ~ 400MHz, so the mobile phone shielding system is invalid for this device, and because this device belongs to a one-way transmission system, the mobile phone-type receiving terminal does not transmit signals to the outside and is always in the receiving state. The detection dog cannot be found.

Uses: Applicable scopes are criminal investigation, technical investigation, economic investigation, anti-drug, anti-smuggling, political security, national security, security, anti-corruption, anti-terrorism, anti-cult and other departments, as well as on-site negotiations, interrogation rooms, gambling, television broadcasters, hosting, filming Command and other places.

Principle of invisible earphones: Invisible earphones connected to mobile phones are the earliest invisible earphones in China. It is characterized by simple usage and can be directly connected to mobile phones without distance restrictions. It was very popular in the early days, but in view of the fact that anti-shielding and detection dogs have been used in most parts of China, the use of such headphones has been greatly restricted. Anti-shielding and anti-detection equipment can shield and detect mobile phone type invisible headphones, because the channel that the mobile phone walks is 800-900

1. Turn the transmitter power switch to the wireless headset position, and the power indicator is on. (If the TV is turned off).

2. Press the remote control headset button light is on, press the reset button for 1 second and release

3. Press the search key again for 1 second and release, wait for 3-5 seconds to receive the sound from the transmitter; otherwise repeat step 3.

4. Turn the transmitter power switch to the wireless headset position, and the power indicator is on. (If the TV is turned off).

5. Press the remote control headset button light is on, press the reset button for 1 second and release

6. Press the search key again for 1 second and release, wait for 3-5 seconds to receive the sound from the transmitter; otherwise repeat step 3.

7. Set the channel and handset number of the SMS repeater, and bundle the mobile phone number for sending SMS: Use the mobile phone to send data in the following format to the SMS repeater, "Set up the XX channel YYY handset", XX indicates the channel to be set ( The SMS transmitter only supports 1-50 channels for the time being), YYY indicates the handset to be set currently. The SMS repeater will save the current settings and the SMS mobile phone number to the MCU (will save when power is off) for bundling. After the setting is successful, the SMS repeater will send Learning signal sent successfully to the bundled phone number. Send "Setting error, please reset channel and handset number" to the bundled mobile phone number. Note: The SMS repeater can only transmit information to the bundled mobile phone text messages. Unbound mobile phone text messages are not processed.

8. Send the "learning" signal: use the mobile phone to send the data in the following format to the SMS repeater, "learn", the SMS repeater will forward the receiver learning signal after receiving it, and it will send "learning" to the bundled mobile phone Signal was sent successfully "message.

9. Send message: Send the message to the SMS forwarder with your mobile phone. As long as the mobile phone number is the same as the number that sent the setting information, the SMS forwarder will forward it. After the forwarding is completed, it will send a "message forwarding success" to the bundled phone number. Text messages sent by other mobile numbers will be filtered and will not be forwarded.

Remove the battery when the wireless invisible headset is not used for a long time;

The battery must use a special charger when charging wireless invisible headphones;

Connect the computer and the mobile phone with a data cable, and send the information with the mobile phone software. You can edit the long text message sent by the computer. The mobile phone will be divided into multiple text messages to send. However, the order of receiving multiple text messages may cause the order of text pages to be different due to network transmission.

Use China Mobile s Fetion function to send text messages, but be careful not to enter a nickname when registering for Fetion online, otherwise nicknames will be added to the beginning of received text messages, making setup and learning unsuccessful. When inputting more than one text message (70 Chinese characters or 140 English mothers), Fetion will automatically add (1/2) or (1/3) at the beginning of the text message.

Note: The SMS repeater will automatically send a SMS confirmation to the sending mobile phone every time a SMS is received. And the memory function will not be affected by the power failure setting. Be sure to pay attention to the use process: insert the microphone output plug into the computer MIC port, wireless voice chat within two meters from the microphone. Computer, TV, DVD volume affects the volume and sound quality of the receiving headset.

Connection method (connect phone, PHS, walkie-talkie):

1. Self-equipped earphone cable for a mobile phone.

2. Cut off the earphone of the mobile phone's earphone cable, but keep the microphone so that you can talk to each other.

3. Strip the plastic skin of the headphone cable (about 10 mm), and you can see several fine enameled wires in two colors.

4. Use a lighter to burn the varnish of the enameled wire about 5 millimeters. Thin wires of both colors must be burned. Scrap the black carbonized layer with your nails. Be sure to scrape it off.

5. Twist the burnt enameled wires according to color. The two colors of wires cannot be mixed together.

6. Take out the single-head audio cable in the invisible wireless headset package, and you can see the pink and white wires.

7. Twist the two sets of wires (four heads) mentioned in 5.6 separately, and they can be welded if necessary.

8. Use electrical cloth, thermoplastic tube, band-aid, adhesive tape, etc. to wrap one group so as not to short-circuit with the other group.

9. At present, most of the newly produced mobile phones in the market are stereo headphones, that is, the left channel and the right channel. Therefore, when connecting to the host, only one of the headphones needs to be connected.

Because the working principle of the invisible wireless headset is completely different from the principle of mobile phone communication, the existing test room safety electronic devices such as "detection dogs" and "mobile phone signal blockers" are ineffective in front of them. Therefore, in recent years, invisible wireless headsets Examinations are in a flood of states, and a large number of unscrupulous merchants mislead candidates with slogans such as "anti-screening and anti-detection" and "prohibition of cheating in exams" ^[1] .

In order to completely eliminate the bad influence of invisible wireless headphones in the society, the Beijing Research and Development Center has invested a lot of scientific research force and successfully launched the exclusive domestic product "detection of cheaters" specifically detecting "invisible wireless headphones" with accurate positioning and a high success rate 99%, completely make the invisible wireless headphones no longer invisible, and fundamentally prevent the illegal use of invisible wireless headphones in the examination room ^[1] .

The "detection cheaters" and "detection dogs" are completely different from each other due to their implementation principles and detection objects, and are two types of products. "Cheat Detector" specializes in detecting wireless headphones (invisible headphones), and its professional type can also detect signals from wireless cameras or mobile phones. "Probe Dog" is specifically used to detect mobile phone signals in wireless cameras or long-term communication ^[1] .

Why can't "anti-detection anti-shielding invisible headphones" be found by "detection dogs"? Because the headset itself does not have the problem of being shielded or detected, the shield or detection mainly occurs on the communication equipment connected to the headset. The basic configuration that is popular among users now is invisible earphones with mobile phones, so it is mainly mobile phones that are shielded or detected. Currently, mobile phone shielding systems on the market are mainly for CDMA869-880MHz, GSM925-960MHz, DCS1805-1850MHz, PCS1900-1990MHz These four frequencies interfere; the detection range of the detection dog is generally 100MHz to 2600MHz. The anti-shielding anti-detection transmitter works at 200 ~ 400MHz, so the mobile phone shielding system is invalid for this device, and because this device is a one-way transmission system, the mobile phone-type receiving terminal does not transmit the signal outward, and is always in the receiving state, so the detection Dogs are powerless ^[1] .