More than ever, we can benefit from shungite for EMF protection, as well as Wi-Fi. Here you can buy a shungite mobile phone protector.
It has a glue to attach but it isn’t very strong and the plate moves. So I in one instance glued mine to the phone, but then just placed it between back of phone and cover. That also helped in not break.
Buy the “Shungite” book so you can see the healing properties and what tests were done. These were done to show that shungite is more effective than other stones at blocking WiFi etc
If you are going to have an effective WiFi protection against PCs, phone etc at your desk so buy multiples and get a discount. Reason is because tumbles like these are lower grade shungite which can be tumbled and are budget friendly. Note that dimensions are a guide.