KERUI Wireless ANDROID IOS APP GSM Home Security Alarm System DIY Kit with Auto Dial KR-8218G The alarm system up to 99 wireless zones, each wireless zones can be defined as one of the 8 zone types, each zone can setup the siren independently.There are 8 zone types(Normal,Stay,Intelligent,Help senior,Chime,Welcome,Emergency),if you set a door sensor into Chime or Welcome zone type,when the door be open,the alarm host will saydingdongWelcome. The alarm system can be used internationally,it can work under three conditions:No network,standalone on-site alarming;Put-in a GSM SIM card,Connect to landline,you can choose one of three ways or use all of them.The whole system complete with fully programmable main unit and wireless sensors.Before using,please kindly read manual and remove the insulating sheet inside sensors. No network,standalone on-site alarming:when there are alarming,the alarm panel built-in siren up to 80db and extra siren will make alert sound,somebody in home will know whats happened;The panel built-in Ni-Hi rechargeable battery will last about 8 hours,Door/Window contacts detect any forceful break-in,Passive motion sensors detect any suspicious movement or activity,Loud,wired siren up to 110dB alarm alerts neighbors and deters potential intruders,you can control the system via controller. Put-in a GSM SIM card:the alarm panel just support GSM SIM card need 2G service,when the sensor is triggered,the alarm panel will make a call or send alert message to the alert phone number (6 groups)you set before,you also can set CID number.In this case,the GSM(only)frequency is 850/900/1800/1900MHZ,which can be applied in all over the world,you can control the system via calling/sms,app,controller. Connect to landline:the alarm panel can work with landline,support ADSL format,if in your home it is Voip,you can use a modem to change it to ADSL.In this way,the alarm panel just make an alert call to alert phone number(6 groups)or CID number you can set,no SMS function,you can control the system via calling,controller.