Product works correctly; very good price / quality ratio

This product requires a little time to understand its programming and operation.
Feel free to search the net and youtube with the keyword: Alarm G1.
some startup tips:
- Insert a sim card after disabling its PIN if necessary
- The basic principle is to send SMS to your mobile sim card number that is inserted into the alarm.
- SMS format is "password of the alarm (originally 1234)" "control" "data"
For example the first sms to send is: where 1234DD06xxxxxx 06xxxxxx is its own mobile number; this allows Following dialogue with the alarm via SMS.
Another tip: do not connect the siren as a whole is not fully programmed and mastered.
In short, do not buy the eve of the holiday, but to take time to understand and installation.