High Point Dritz 694 Disappearing Ink Marking Pen, Purple Compatible with all of RR35xx and RR4xxx series. Support up to 48 hours for data protection. Recharging and charging time for BBU (from empty to full) will be within 30 hours. Warning indicator and alter with alarm buzzer for low charge. Recharging and charging time for BBU (from empty to full) will Monitor the health status (temperature and voltage) of the BBU. Monitor the percentage of charge present in the BBU. Monitor the status of BBU when charging and discharging. Detection of BBU (Present or Disconnect) in controller BIOS and Web GUI.