technical features: ◎ taking use of technology of interferencing superhigh frequency. ◎ vintelligence controlling technology taking charge of the power outputting within the scope of 5 meters. ◎ high effective channel power with rater big semidiameter of interception. ◎ effectively making subsections, just interferencing downlink and causing no interception of base station. ◎ imported elements: slow start up design of circuit can avoid the appearance of sparking when turn on or turn off the machine. furthermore, these elements can maintain the stable operation condition with high intergration.