​The material contained on this page is informative only. Authoritative compliance information is contained in the applicable Bluetooth specification.


Name: Characteristic User Description

Type: org.bluetooth.descriptor.gatt.characteristic_user_descriptionDownload / View

Assigned Number: 0x2901


The Characteristic User Description descriptor provides a textual user description for a characteristic value.

The information contained on this web page is informative.

Informative means that the text may provide background or context to the authoritative text contained in the adopted Bluetooth specification. Informative text is not considered when determining compliance to the Bluetooth specification. Please refer to the adopted Bluetooth specification for the normative (i.e. authoritative) text used to establish compliance. Compliance issues due to errors on this web page are not the responsibility of the Bluetooth SIG and rest solely with the member.


If the Writable Auxiliary bit of the Characteristics Properties is set then this descriptor is written. Only one User Description descriptor exists in a characteristic definition.

Value Fields

Names Field Requirement Format Minimum Value Maximum Value Additional Information
User Description
utf8s N/A N/A None