All support subscriptions include an advance hardware replacement service, which means that WatchGuard will ship a replacement via pre-paid, next-day airfreight in advance of receiving the returned appliance. Customers with mission-critical requirements that need replacements sooner can purchase the premium 4-hour RMA subscription with round-the-clock coverage. With this upgrade, a courier will deliver a replacement appliance on-site from local stocking depots within 4 hours of RMA approval by WatchGuard Support.