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# Characteristic Properties

The properties that characteristics can have.

## Discussion

Check to see if a characteristic’s [`properties`](/documentation/HomeKit/HMCharacteristic/properties) array contains any of these constants to learn something about the corresponding characteristic ([`HMCharacteristic`](/documentation/HomeKit/HMCharacteristic)).

## Topics

### Properties of Characteristics

[`let HMCharacteristicPropertyReadable: String`](/documentation/HomeKit/HMCharacteristicPropertyReadable)

The characteristic is readable.

[`let HMCharacteristicPropertyWritable: String`](/documentation/HomeKit/HMCharacteristicPropertyWritable)

The characteristic is writable.

[`extern NSString * const HMCharacteristicPropertySupportsEventNotification;`](/documentation/HomeKit/HMCharacteristicPropertySupportsEventNotification-19wy1)

The characteristic supports event notifications.

[`let HMCharacteristicPropertyHidden: String`](/documentation/HomeKit/HMCharacteristicPropertyHidden)

The characteristic should be hidden from the user.


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