   ['--save [FILENAME]', 'save picture']
   ['--delete [Object ID]', 'delete a picture']
   ['--battery', 'check battery level']
+  ['--get_volume', 'get audio volume']
+  ['--set_volume [NUMBER]', 'set audio volume (0~100)']
 ]
 
 parser.on 'help', ->

      console.log "BatteryLevel: #{res.dataPacket.array[0]}"
      theta.disconnect()

if process.argv.length < 3
  parser.on_switches.help.call()


    % theta --list
    % theta --id [object_id] --save out.jpg
    % theta --delete [object_id]
    % theta --battery
    % theta --get_volume
    % theta --set_volume 20
    % DEBUG=* theta --capture  # print all debug messages
  """
  console.log parser.toString()
