... continue to work when AC power off5.With built-in speaker and microphone,can remote speak and talk with ... signal,system will turn to 2G mode, auto dial out phone numbers and send MMS.17.Auto dial 6 ... the 3G camera3.The 3G camera will auto dial out preset 3G number,wired-connected siren will go off ... camera,turn off/on siren,listen in,two-way talk,arm/disarm,zoom in/out,etc. 3G Security Cameras with SIM ...