cell phone jammer is manufactured with adopting the advanced foreign technology

Operating frequency of   cell phone jammer are: CDMA870-880MHz, GSM930-960MHz, DCS1805-1850MHz and PHS1900-1920MHz, TDSCDMA2010-2025MHz, WCDMA2130-2145MHz based on “health standards” in the “frequency of 300MHz ~ 300GHz, corresponding wavelength 1m ~ 1mm for the microwave range of electromagnetic waves “is defined, which belong to the microwave frequency band. china cell phone jammer is manufactured with adopting the advanced foreign technology. “Health standards” in the intensity and frequency characteristics of electromagnetic radiation on the human body may cause potential adverse effects of the threshold value under the sector, will allow the environmental electromagnetic radiation standards are divided into two, and developed a standard and secondary standard . Respectively, the wavelength (frequency), intensity, distance, calculated detailed provisions. (Note: a standard for the safe area, refers to the intensity of electromagnetic waves in the environment long-term residence, work and life of all people (including infants, pregnant women and old and sick persons), will not be any harmful impact on the area; special pointed out that the new construction, renovation or expansion of radio, television and radar and other transmitting antenna, in its coverage area residents must meet the “standard level” requirements. 
Therefore, to determine whether electromagnetic radiation will adversely affect the human body, from electromagnetic radiation, the main sources of radiation with distance from the position and other aspects into account. We know that cell phone radiation, electromagnetic wave shielding device is achieved through an antenna, so the installation of mobile phone jammers, the selection and design of the antenna is directly related to the quality of the shielding system. To control the impact of electromagnetic waves on the human body, to protect people’s health, all countries have developed their own standards for electromagnetic protection.
For the middlemen, especially contractors, for the prison project, once used to detect shielded or individually shielded devices are known to be ineffective, the project completion and acceptance of a problem, post-maintenance is the problem, thousands of successful projects may take until the acceptance to 200,000, or must engage in relationships in order to barely fool in the past, post-maintenance is not a small expenditure, over time, the phone screen is somewhat prohibitive, then also makes the mobile phone screen industry confusion .
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