Offered in 3 models that include 8 circuits but can hold up to 10, HomeLink™ Upgradeable Manual Transfer Switch lets homeowners push one button to switch to portable generator source during outages in order to power hard-wired circuits in residence. Design also lets electricians change out subpanel, which prepares prewired switch for automatic home generator to back up essential circuits (max 11 kW). Lights indicate when utility or generator power is available/being used.