Self diagnostic reports via email testing com, mic, speaker switch Automatic polling and programming software included 2 amp relay contacts for door/gate or SL 2 strobe light control SIP compatible PoE powered class 1, 4 watts Automatic Noise Canceling ANC feature for proper operation in noisy environments VoIP eliminates the need for Push to Talk mode Network downloadable firmware Handsfree operation Programmable to dial up to 5 numbers on busy or ring no answer Cycles through backup phone numbers on busy or no answer Hangs up on busy signal, time out or touch tone command Remotely programmable Extended temperature range 30 F to 130 F 3 different chassis or board only available Volume adjustments for microphone and speaker Optional PB 100 polling system available Optional SL 2 or BLK 4 EWP strobe light kit available