Thank you for your support of Xiaomi products and we apologize for any inconvenience caused. When the Xiaomi Focus Pen is attached to the Xiaomi Pad 7 and its battery level is below 80%, it begins the charging process. This can cause both the pen and the area where it attaches to the tablet to warm up. This is a normal occurrence as the device charges, and it should not be a cause for concern. Once the Xiaomi Focus Pen reaches a full charge, the temperature will return to normal. The Xiaomi Pad 7 has undergone a thorough inspection process during production to ensure its safety in various usage scenarios. Rest assured, you can continue using the device confidently and safely.