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 Blue “Call Connected” LED indicator SIP compatible PoE powered class 1, 4 watts Automatic Noise Canceling ANC feature for proper operation in noisy environments Network downloadable firmware Handsfree operation Marine grade 316 stainless steel prevents corrosion on the stainless steel models 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 15 F to 130 F 3 different chassis or board only available Volume adjustments for microphone and speaker Flush mountable using the included roughin box or can be surface mounted using an optional VE 5x5 Surface Mount Box