Automatic polling and programming software included2 Amp relay contacts to control an SL-2 Strobe Light (DOD 242) or LV-1K Line Verification Panel (DOD 246)Red Call Connected LED indicatorSIP compliant (see Product Manual for list of compatible IP-PBX phone systems)PoE powered (class 1 <4 Watts)Automatic Noise Canceling (ANC) feature for proper operation in noisy environmentsVoIP audio detection eliminates the need for Push to Talk modeNetwork downloadable firmwareHandsfree operationMeets ADA requirements