... products are: video camera dvr gsm alarm, gsm/telephone alarm system, MMS alarm, microwave/pir sensor switch, camera and various accessories ... spread all over the world.Our strength:1, familiar with MCU, ARM system development process 2, profound knowledge of EMS, which ... of GSM/GPRS/CDMA/GPS and short distance wireless communication(2.4g, 433/315mhz)7, familiar with RS485/232,DMX512,CANBUS port and ...