The heart of the ComPoint system, the ISH1 Hub connects the keypads and door stations. It provides your choice of seven different doorbell chimes, assignable to the door stations by your installer.Up to six hubs can link together to accommodate up to 36 zones.PRODUCT FEATURES:- System expands to up to 36 zones for larger homes or room to grow - Choice of seven doorbell chimes, with adjustable chime volume level - Organizes door station, intercom and paging functions according to priority level - Reliably manages communications throughout the home - Designed to easily install in a structured wiring panel and uses CAT-5 connectivity