... .Our strength:1, familiar with MCU, ARM system development process 2, profound knowledge of EMS, which helps to design a qualified ... .5, familiar with the design and application of high frequency wireless communication.6, well know the application of GSM/GPRS/CDMA ... /GPS and short distance wireless communication(2.4g, 433/315mhz)7, familiar with RS485/232,DMX512 ...