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General features: GSM security alarm CWT5021A is a GSM alarm system based on GSM network and MMS service. It can used in home or small offices. It can connect wireless sensors based 433MHz. Key features: 5 pre-set mobile phones for mms/sms receiveAlarm pictures send to mobile phones by mmsPre-set mobiles can inquery picture anywhere and anytimeAutomatic Arm/Disarm by timerPictures also send to pre-set emailsLive voice listen supportRemote controller with panic buttonSupports up to 10 pcs wireless sensors, each sensor can be named by userMore Programmable to set its features, e.g.: delay time, edit the sensor names, send SMS to users or not when power failure, turn on siren or not, etcSpecifications: Quad-Band: 850/900/1800/1900MhzPower Voltage: 12VDC 1.5AOperation temperature: -24C +65CHumidity: 10% 90%Wireless sensor receiving frequency: 433MHzWireless sensor encoder chipset: ev1527 or pt2262Internal Battery: 900mAH, about 12hoursStandard Package list: Mainframe X1 Remote contol X2 Wireless PIR Motion Sensor X1 Wireless Door magnetic Sensor X1 AC/DC AdaptorX1