APC Smart-UPS RT 20kVA RM 208V LCD display: Alpha-Numeric Display which displays system parameters and alarms. Removable input/output wiring tray: Allows quick and easy installation and maintenance of the UPS. Rack/Tower convertible: Protects the initial investment in the UPS when migrating from tower to rack-mount environment. Manageable external batteries: Reduces preventative maintenance service needs by monitoring the health and status of the external batteries and their expected runtime.