Click to expand Tap to zoom Honeywell HC900 900E01-0100 : Redundancy Module by Honeywell Please contact us for price Redundancy Module SKU 900E01-0100 Quantity Add to cart Request for quote Buy it now This item is a recurring or deferred purchase. By continuing, I agree to the cancellation policy and authorize you to charge my payment method at the prices, frequency and dates listed on this page until my order is fulfilled or I cancel, if permitted.