Halogens are typically used in the manufacturing of certain types of electronic components, including LED displays. However, due to environmental concerns and regulations, manufacturers have started to produce halogen-free versions of these components.

In the case of an air fryer, it is possible that the 7-segment LED displays used in the appliance are halogen-free. This means that the LED displays are manufactured without the use of halogen-based materials, such as halogenated flame retardants.

The use of halogen-free components in electronic devices, including LED displays, helps to reduce the environmental impact and potential health risks associated with halogens. It also ensures compliance with regulations and standards that restrict the use of certain hazardous substances in electronics, such as the Restriction of Hazardous Substances (RoHS) directive.

Overall, the use of halogen-free 7-segment LED displays in an air fryer demonstrates the manufacturer's commitment to producing environmentally friendly and safe products.