GSM panicbuttonwithtelephoneforhelpFeaturepressthecallbuttonforhelp,Itcouldconnecttoservicecenter.setthefamilytelephonenumberkey.pressthebuttonconnectedtothefamilydirectely,don'thavetodailthenumber.dialthecommonphonenumberaswellanswerthephoneasusualusetheremotecontroltodailthenumber.it'scouldconnecttoservicecenteror911TechniqueinformationPowersupplyDC=12V-8.4V(innerbatteryDC=12V)StaticCurrent:11≤15uATransmissionCurrent12≤15mATransmissionFrequency:f=315/433.92±0.2MHzTransmissionDistance:Noobstacle≥80mTransmissiontime:T≥1sInternaldistance15mmWorkingTemperature-1040Relativehumidity≤90%StandardAccessories:1normaltelephone,2panicbuttons