The advantages of the S3021: 1. Easily to operate, only enter into 1 or 2 or 3 through dialer then you can remotely control it. 2. Easily to set it, only enter into the alarm telephone numbers through the dialer. 3. Support wireless outdoor loudly siren, so the neighbor can hear the alarm information while the system was triggered, also the loudly sound can terrify the Intruders or Burglars. 4. Arm or Disarm by phone or Remote controllers 5. Standby inner re-chargeable battery so needn''t worry the AC power off. 6. With Voice alarm alert, so police now where your home is it. 7. Small Size and attractive functions, Moreover, very easily to operate it. King Pigeon Hi-Tech.Co.,Ltd., the biggest GSM Alarm CE Approved OEM supplier, including GSM Home alarm, GSM Car alarm, GSM GPS Vihecle car alarm systems,support SMS Commands. At present,most of our managers are technical and marketing experts including 60 software and hardware engineers,most of them are major in wireless telecommunication or many years experienced in RF designing .Meanwhile,we cooperate with many high technology partners and institutes, as well as many professional Universities all the time.