Telephone interconnect capability. DTMF remote control capability. Optional wall mount bracket, MB-77 and 19inch rack mount bracket, MB-78. Accessory connector (D-sub 25pin) on the rear panel for trunking controller. Compatible with VEGA tone remote control system. Optional Voice Scrambler UT-109 or UT-110. CW ID transmitter (DTMF or 5-tone also selectable). Password and kill/stun function for security. 16-digit alphanumeric display. Self check function checks for internal errors and alerts with a phone call. Master/Slave backup operation by connecting two repeaters.