Shenzhen Eray Electronic Co.,Ltd is a professional home DIY alarm systems and environment monitoring system manufacturer since year 1998 of all types of alarm systems,integrating development and production together.Our parent company is Shenzhen Chitongda Electronic Group.Our main products include gsm alarm system,Old/Kid SOS alarm system,PSTN alarm system,PSTN+GSM dual network alarm system,Smart network vedio alarm system and environment detectors.With 16 years experience in alarm system ...