Line-R Features & Benefits: Protection Automatic Voltage Regulation (AVR): Automatically steps up low voltage and steps down high voltage to levels that are suitable for your equipment. Lightning and Surge Protection: To prevent damage to your equipment from electric power surges and spikes. Resettable circuit breaker: Easy recovery from overloads; no need to replace a fuse. Convenience Status Indicator LED’s: LED status indicators for each phase and an audible alarm provide immediate failure notification when surge suppression circuitry has been damaged by a heavy strike or surge. Transformer Block Spacing: Connect bulky transformer block plugs without covering up other outlets.