Intercoms & PA – GSC3516 Product Description GSC3516 Multicast Talk-Back Speaker Full-duplex speakerphone with HD acoustic chamber, advanced acoustic echo cancellation 3 directional mics, 1 omnidirectional mic Integrated Wi-Fi and Bluetooth ® One 10/100Mbps network port with PoE/ PoE+ 2-pin multi-purpose input See also different: Facility Access Systems – GDS3712 GXV IP Video Phones – GXV3350 Unified Communications – GRP2634 Unified Communications – GRP2610(P)