Four selectable alert types are available to the user from the front panel buttons – Audio, Chirp, Vibrate, and Silent. When the Audio alert type is selected, any of 5 alerting sequences can then be selected from the front button controls. The NP88 Messaging features include Duplicate Message Detection, Selectively Erase Message or Erase All Messages, Message Time and Date Stamping, and Memory Retention that keeps the messages in memory when the pager is turned off or the battery replaced. Low Battery, Reminder Alert, and Message Overflow are a few of the information and status indicators.