APC AV Network Manageable 20 Amp G Type Rack Power Filter, 120V LED & display dimmer Adjust the unit's LED and display brightness independently of each other to suit your individual tastes and environment. LED Indicators Provide easy-to-read status of the unit and utility power conditions. LED & display dimmer Adjust the unit's LED and display brightness independently of each other to suit your individual tastes and environment. Sequenced turn on/off Helps power on components in the proper order to prevent speaker stress. Proper sequencing can also help manage current draw on startup to prevent unnecessary circuit breaker tripping. Isolated filter banks Eliminates electromagnetic and radio frequency interference (EMI/RFI) as a source of audio-video signal degradation. Dataline Surge Protection Provides protection of connected equipment from power surges on the data lines. Power conditioning Protects connected loads from surges, spikes, lightning, and other power disturbances. Safety-agency approved Ensures the product has been tested and approved to work safely with the connected service provider equipment and within the specified environment.