You can use the specific version you purchased indefinitely with no annual subscriptions.
Access to sophisticated scheduling, such as complex recurring alarms and the ability to run external programs or open URLs upon wake-up. How to Get and Use Your Product Key hot alarm clock product key
A product key transitions the software from a "trial" state to a "lifetime license". Once activated, the program removes the purchase reminders that appear during startup and unlocks several long-term benefits: You can use the specific version you purchased