SS1603-12-MULTI is 3G Digital GSM intercom. Designed a group of keypads. Use the keypad to press the account number to dial to the specified user. It is the way to use the 3G network. It can also control the door entrance. You can also use the keypad to enter the password to unlock.
3G Audio Intercom, is the latest development and is a GSM/3G enabled door intercom which is made of aluminum hence is more durable. It has 8 buttons, each for a separate user to share 3G intercom and each button can store set of 3 telephone numbers. This door intercom can be used by up to 8 residents.