This is a common question for shungite products, so it is important to be clear: the product information describes the pyramid as a mineral object for creating a calmer atmosphere and an intentional environment. It does not say that the pyramid blocks, absorbs, or neutralizes electromagnetic radiation from computers, phones, Wi-Fi, or other household devices. Treat any claim that it does as unsupported.
If your goal is to reduce exposure to electromagnetic fields, the practical steps are to keep devices at a distance, switch them off when not in use, use wired connections where possible, and follow general advice about screen time. A small stone pyramid placed on a desk can be a pleasant visual reminder to take breaks from screens, but it is not a substitute for those measures.
That does not mean the pyramid is useless. Many people simply like having a natural object near their workspace as a way to make the environment feel less electronic and more grounded. If you choose it for that reason, place it wherever you can see it, and let it serve as a reminder to step away from the screen, breathe, or change your posture. Just do not rely on it as a protective device.