How to use

VolumeSelector

function

in

Characteristic

this.on('close', () => {
        this.debug('remove event listeners');

        tvService.getCharacteristic(Characteristic.Active)
          .removeListener('set', setActive);

        tvService.getCharacteristic(Characteristic.ActiveIdentifier)
          .removeListener('set', setActiveIdentifier);

        tvService.getCharacteristic(Characteristic.RemoteKey)
          .removeListener('set', setRemoteKey);

        tvService.getCharacteristic(Characteristic.PowerModeSelection)
          .removeListener('set', setPowerModeSelection);

        speakerService.getCharacteristic(Characteristic.VolumeSelector)
          .removeListener('set', setVolumeSelector);
      });