Electromagnetic fields are created by electronic devices such as laptops, cell phones, computers and tablets all put out EMFs. Placing this Shungite phone protector on your devices will not interfere with their operations, but will block out some of their free radial output. A small stone with tremendous powers. We are all hours on the phone, protect yourself and your loved ones with this Shungite phone protector. Size: appr. 2.4 cm x 1.4 cm/ 1 inch x 0.6 inch