3G GSM Alarm Kit INTERVISION EXPRESS GSM ULTRA. Stand-alone GSM signaling device EXPRESS GSM ULTRA 3G standard with battery power (no 220V network required), contacting the owner (using your pre-recorded message), and sending a text message (when in active mode). When triggered, this signaling device contacts the owners (up to 3 people) with a call to the programmed phones, and then sends them text messages (unless the phone owner has dropped the incoming call); the owner of the phone while pressing the keys # or * on his phone; or the whole operation is performed using the remote control. The device includes a built-in siren with an acoustic power of 130 decibels (which can be turned off); it is also optionally possible to add additional wireless sensors and sirens to the system. Considering the power supply of the detector is provided by 3 standard AA batteries, the detector can be used in various places.