US Patent 12102163 Magnetic fastening device

A magnetic fastening device for releasably fastening a first unit and a second unit to each other. The first unit has a first unit abutment surface. The second unit having a second unit abutment surface. The first unit abutment surface and the second unit abutment surface are adapted for abutment against each other. The device includes at least one pair of magnets including first magnet allocated to the first abutment surface and a second magnet allocated to the second abutment surface. The first magnet and the second magnet exert an attractive force to each other. The first unit may be or include a communication device and the second unit is a helmet or a separate unit permanently fixed to a helmet.