The general emissive power of cell phone blocker is 0.5W.Meanwhile

In order to achieve electromagnetic compatibility, we must proceed from the above three basic elements, the use of technology and the organizational measures to be taken so-called technical measures, that is, from the analysis of electromagnetic interference source, the coupling means and sensitive equipment to proceed to take effective technical means to suppress interference source, coupled to eliminate or reduce harassment, the harassment of sensitive equipment to reduce or increase the magnetic sensitivity of the response level; The cell phone jammer applies alloy in its outer shell.to a limit of human disturbance, and verify the effectiveness of the use of technical measures, organizational measures must be taken to develop and follow a complete set of standards and specifications, a reasonable spectrum allocation, control and management of spectrum use, based on the frequency, hours of work, the antenna directivity and other regulations work, analysis of electromagnetic environment and select the layout area, the electromagnetic compatibility management. Ferrite: ferrite is a series of complex oxide materials containing iron oxide (or known as the ceramic material). Ferrite is characterized by a saturation magnetic flux density is very low (0.5T or less), but the relatively high permeability, and high resistivity (This is because the ferrite particles is pressed into the small, poor contact between particles, so the poor conductivity), so it is beneficial to reduce eddy current losses.The international advanced twice-oxidize technology was applied to treat the surface of  cell phone jammer . Because of this, iron oxide body can be at very high frequencies (up to trillion Hz or even higher) to use, but it's saturated magnetic flux density is low, therefore not suitable for use in low frequency. ferrite is the most extensive use of high-frequency transformer core and the types of inductor core. commonly used soft magnetic components: Transformers: The so-called transformer, is the use of electromagnetic induction of AC voltage conversion device. the principle of the transformer has been in the "electromagnetic induction" in the description because the transformer core in a changing electromagnetic field , the core material of the magnetization and magnetic induction intensity is changing. This naturally calls for core materials resistance to this change, the change is sensitive enough, so almost all of the transformer core, high permeability are required. The general emissive power of cell phone blocker is 0.5W.Meanwhile, the alternating electromagnetic field is bound to generate energy loss in the core (for example, eddy current), all also requires a low iron loss material to reduce the core temperature rise, increase transformer efficiency transformers and a wide variety of forms in different occasions, different ways of working transformer, so the specific requirements of the transformer core is also very different. low-frequency transformer: low frequency (eg, lower than 1KHz) In general, the operating point current and voltage are low is the sine wave due to low frequency core loss is low, they can sense the magnetic core of the work of a higher than design, so when the need for a high saturation magnetic induction as a core of soft magnetic materials, such as silicon steel. with silicon as power transformer core, the work can reach 1.4T magnetic induction above.The  cell phone jammer  could only be used as protecting users’ privacy. Fe-based amorphous alloy transformer core as when the operating point can reach 1.3T. In order to improve the efficiency of the transformer, requires low loss iron core materials, and requested materials permeability rate, to reduce the primary coil excitation current to reduce the loss caused by the coil resistance (called copper loss).