Specifications include, but are not limited to: 1. Mass Alert and Notification System must be redundant with multiple data centers; describe system redundancy. There should be no single point of failure. Data should be stored at two or more separate sites, with switchover and failover features. 2. Is the proposed system fully hosted by the vendor or does it require hardware, equipment, store, etc. to be provided by the County? 3. Please provide uptime data for the system for the past three (3) years. Update data should include scheduled maintenance. Provide specific information regarding any system outage exceeding one (1) hour. 4. Explain whether any of your customers have been unable to deliver notifications due to downtime on your system. 5. Solution should provide the ability for residents to opt-out of receiving notifications. Please detail the method used by residents to opt-out of the system.