Technology partner note:Owner Free Freight Excluded From This Vendor ETP-CI-4G-GSMManufacturer: Talk-A-Phone SKU ETP-CI-4G-GSM-2053 4G LTE GSM cellular interface for ETP-500 Series Analog Call Stations. Includes MIMO antenna kit. Cellular interface supports 12VDC input. Please add power supply if 110VAC input is required. Please log in to see price or purchase this item Request an account Line Comment Special Price MAC Address Item Uploads: Upload