Electronic devices and accessory devices designed for communication with electronic devices are disclosed. An accessory device suitable for use with an electronic device can receive the electronic device. Subject to authentication, the electronic device can read information stored on the accessory device through respective wireless communication circuitry of the electronic device and the accessory device. For example, the accessory device can store information related to the material makeup of the accessory device, dimensional information of the accessory device, and other integrated features. This information can be read and received by the electronic device. As a result, the electronic device can adjust a control system (that regulates thermal energy generation) by increasing a set point temperature that allows one or more processors to operate in a manner consistent with additional thermal energy generation. However, the accessory device protects the user from exposure to the additional thermal energy, thereby preventing injury.