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 MKK21RADD0, 144 L, SN-T, 33 dB, D, White Siemens iQ500 MKK21RADD0. Fridge net capacity: 144 L, Climate class: SN-T, Noise level: 33 dB. Fridge number of shelves/baskets: 4, Number of vegetable drawers: 1. Lamp type: LED. Door hinge: Right. Annual energy consumption: 75 kWh, Energy efficiency class: D. Weight: 35.3 kg. Product colour: White