There exists a typical problem for cell phone jammer

There exists a typical problem for  cell phone jammer .
The core industries of Guangdong Optical Valley "will light communication technology products and optical communication system software-based. Are building a Guangzhou, Shenzhen, Dongguan, Huizhou, Zhuhai, Zhongshan, Foshan and other opto-electronics industry with the Pearl River Delta hinterland. Is to establish and improve the information network of photonics industry, R & D network and service network, the establishment of a photonics technology transfer and product trading center, photonics technology industry research and development center, Optoelectronics testing and certification and monitoring of the service center, optoelectronics technology service center. In the past two years, with the construction and development of the "Guangdong China Canton Valley, the photonics industry in Guangzhou has achieved rapid development, It is reported [8], in Guangzhou optoelectronics industry output in 2001 about 12 billion yuan, accounting for Guangzhou High-tech The output value of 19.71%, in 2002 about 15 billion yuan, accounting for 18.75% of the high-tech product output value of Guangzhou City. For now, when showing a teaching task, teachers have to stand right beside the computer without cell phone jammer .
As of September 2002, Guangzhou enterprise engaged in the photovoltaic industry a total of 325 of them engaged in the production of optoelectronic technology, research and development enterprise 158, another 167 enterprises engaged in optoelectronic products sales and service. Guangzhou has formed the optical display, optical storage as the core of the photonics industry group. Photoelectron output in the first half of 2003, the Guangzhou Science City, about 70 billion yuan, is expected this year will grow by about 50%. Guangzhou City is planning the construction of optoelectronic industry base in Nansha Development Zone, in accordance with the "development started in 2001 livelihood nano-engineering, the establishment of the Southern Center for Nanoscience and development strategy, is through the implementation of the" 4412 Project "(the development of nanophotonic materials and devices industry four areas of focus. The original purpose of using multimedia facilities including  cell phone jammer  is making teaching more convenient.All these parts and components of cell phone jammer should be strictly inspected
Establish a the nanophotonic base 4 R & D base, build a Guangzhou nanotechnology information network consisting of nano-technology support service system), to promote the development of nanotechnology and industry. To 2003 in the organization and implementation of the Nano 30 projects, estimated 2 to 3 years is expected to have a number of projects in industrial production, output will reach 2.5 billion yuan in five years. Plans to 2007, fighting for the formation of 3 over 10 billion yuan, 10 over 50 billion yuan output value of the scale of optoelectronic enterprise "aircraft carrier", the city's optoelectronics industry output will reach 550 ~ 650 billion, an annual growth rate 28% ~ 35%, 11 to 130 000 job creation.