This new model is amongst the most energy-efficient in the industry, thanks to Panasonic’s Inverter technology and Twin-Eco Cooling System. The Inverter technology for example, uses a system of sensors and microprocessors to select automatically from multiple possible power levels, allowing the product to run on minimal power overnight and at times of low usage, thereby conserving valuable energy. Together, these innovative technologies have earned the NR-B54X1 an A+ rating in the coveted EU energy efficiency standard.