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# Characteristic events

Events based on the capabilities or characteristics of accessories.

## Topics

### Characteristics

[`class HMCharacteristicEvent`](/documentation/HomeKit/HMCharacteristicEvent)

An event that is evaluated based on the value of a characteristic.

[`class HMMutableCharacteristicEvent`](/documentation/HomeKit/HMMutableCharacteristicEvent)

A mutable event that is evaluated based on the value of a characteristic.

### Characteristic ranges

[`class HMNumberRange`](/documentation/HomeKit/HMNumberRange)

A set of numbers used to specify conditions for characteristic range threshold events.

[`class HMCharacteristicThresholdRangeEvent`](/documentation/HomeKit/HMCharacteristicThresholdRangeEvent)

An event that triggers when the value of a characteristic is within a specified range.

[`class HMMutableCharacteristicThresholdRangeEvent`](/documentation/HomeKit/HMMutableCharacteristicThresholdRangeEvent)

A mutable event that triggers when the value of a characteristic is within a specified range.


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