... oversea customers. Our main products are: video camera dvr gsm alarm, gsm/telephone alarm system, MMS alarm, microwave/pir sensor switch ... of GSM/GPRS/CDMA/GPS and short distance wireless communication(2.4g, 433/315mhz)7, familiar with RS485/232,DMX512,CANBUS port and ... platform and android application software OEM ODM service offer , gsm product design ,sms controller, gsm/gprs communication product