A wearable device is coupled to a band including multiple modular functional band links that are each electrically and mechanically connected to one or more other of the band links and/or the wearable device and include one or more electronic components. In various implementations, the wearable device may receive identifiers from each of the band links, determine functionality available using the identifiers, and communicate with the band links to utilize the determine functionality. In some implementations, the band links may include multiple different output devices and the wearable device may determine to provide an output pattern and signal the respective output devices according to the output pattern. In various implementations, the band links may include multiple different input devices and the wearable device may receive input indications from the input devices and perform an action based on a pattern in which the input indications were detected by the respective input devices.