This alarm is available in Chinese, English, Russian and Spanish, with stable performance and reliable quality. Welcome to buy!         

This alarm uses a GSM 2G network, and domestic customers strongly recommend using China mobile phone card (China Telecom is a CDMA system, which must not be used; Although China Unicom is also a GSM system, however, China Unicom has closed 2G base stations in some areas, causing the alarm to fail to work properly. We strongly recommend that you use China mobile phone card again. Thank you)