Do you worry about the amount of EMF around us now? We're surrounded by it! Phones, WiFi, even electricity in general.
The shape, merkaba, means light, spirit and body. It symbolises the connection of these three things. So keeping this shape around reminds you of this interconnectivity and protects you from stress, negative energies and EMF exposure.
It measures only 2cm and so is small and discreet enough to put on any electrical object or the right size to pop in your pocket and carry all its benefits with you.
Better yet, shungite transforms rather than takes on energies and therefore never needs cleansing!