Replacement 4G Cell Intercom Full Board and Modem

This board also requires a new power supply since the 3G board used a 12 volt supply and this one requires 24 volts. See Related Items Below.

This is also used to replace 4G units that have a yellow circuit board with a black modem daughterboard since they cannot take remote firmware upgrades that are needed for newer AT&T updates.

There may be some firmware updates required depending on the board you have. See these instruction for more detail: Cell Phone Intercom Firmware Upgrade