Each interface comes with two snap track mounts. The Controller can be powered three ways: - PoE (power over Ethernet) - PoE+ when more power is needed - Directly by a 9 – 30 volt dc wall-wart or remote supply - PoE power and 9-30v power can be used together for redundancy and client peace of mind (thanks to diode-summing). Power supply and cabling not included. The PCI also has a second power connector for daisy-chaining additional PCI’s, and remote-sensing terminals for dealing with the I-squared-R loss of a long power cable. If you don’t understand remote sensing and I-squared-R loss consider yourself fortunate. There is a STAND-ALONE mode, which uses Hushbutton MRA Rings to mute local microphones without a connection to third-party audio or control processors. This requires our Hushbutton PCM Audio Isolator, sold separately. Integration with third-party control systems is accomplished via TCP/IP and our documented control API. Open source AMX, Crestron & QSC control modules are available at no extra charge. There is a STAND-ALONE mode, which uses Hushbutton MRA Rings to mute local microphones without a connection to third-party audio or control processors. This requires our Hushbutton PCM Audio Isolator, sold separately. Integration with third-party control systems is accomplished with TCP/IP and our documented control API. AMX, Crestron, Extron & QSC control programming modules are available at no extra charge.