(2 Year Warranty) 1 Telephone Line * 4 Outbound Device Ports (for Outbound Calls Only) *On-Line Extension Protection (Exclusion) *Provides Visual LED Indication of Each Ports Activity Will Never Answer or Transfer Inbound Calls to Any Port * Busy Signal to Second Off-Hook Device * 36 Volt On-hook Voltage (for credit card authorization terminal compatibility) Sharing of up to 4 Outbound Data Devices to Share a Single Phone Line *For applications Requiring More Than 4-Port Connectivity, the TELEHUB 400 Can Be Daisy Chained