... of various colleges and universities, some law breakers cheat with mobile phones, combining with the phenomenon that various middle and advanced ... high school students send messages with mobile phones in class, and the disturbances and noises in serious ... : 139,138,137,136,135,134,133,132,131,130,3G,PHS,etc.Maximum radiated power : less -10dBmOperating frequency: 800MHZ ...