1# JS API Changes of the Power Management Subsystem 2 3The table below lists the APIs changes of the power management subsystem in OpenHarmony 3.1 Release over OpenHarmony 3.0 LTS. 4 5## API Changes 6 7| Module| Class| Method/Attribute/Enumeration/Constant| Change Type| 8|---|---|---|---| 9| ohos.thermal | thermal | getThermalLevel(): ThermalLevel; | Added| 10| ohos.thermal | thermal | unsubscribeThermalLevel(callback?: AsyncCallback\<void>): void; | Added| 11| ohos.thermal | thermal | subscribeThermalLevel(callback: AsyncCallback\<ThermalLevel>): void; | Added| 12| ohos.thermal | ThermalLevel | EMERGENCY = 6 | Added| 13| ohos.thermal | ThermalLevel | WARNING = 5 | Added| 14| ohos.thermal | ThermalLevel | OVERHEATED = 4 | Added| 15| ohos.thermal | ThermalLevel | HOT = 3 | Added| 16| ohos.thermal | ThermalLevel | WARM = 2 | Added| 17| ohos.thermal | ThermalLevel | NORMAL = 1 | Added| 18| ohos.thermal | ThermalLevel | COOL = 0 | Added| 19| ohos.runninglock | runningLock | createRunningLock(name: string, type: RunningLockType, callback: AsyncCallback\<RunningLock>): void;<br>createRunningLock(name: string, type: RunningLockType): Promise\<RunningLock>; | Added| 20| ohos.runninglock | runningLock | isRunningLockTypeSupported(type: RunningLockType, callback: AsyncCallback\<boolean>): void;<br>isRunningLockTypeSupported(type: RunningLockType): Promise\<boolean>; | Added| 21