D means that the product is rated in its category in terms of energy efficiency. The Energy Labeling system is based on EU Regulation 2017/1369/EU. D Siemens iQ500 GS54NUWDV, 328 L, 22 kg/24h, SN-T, No Frost system, D, White Siemens iQ500 GS54NUWDV. Freezer net capacity: 328 L, Climate class: SN-T, Freezing capacity: 22 kg/24h, Storage time during power failure: 25 h, Noise level: 38 dB, Star rating: 4*, No Frost system. Door hinge: Right. Lamp type: LED. Energy efficiency class: D, Annual energy consumption: 212 kWh. Product color: White