code: function (callback) {
          var result = [];
  
          var devices = findBlinkSticks();
          var i = 0;
  
          var finder = function() {
  
              if (i == devices.length) {
                  if (callback) callback(result);
              } else {
                  devices[i].getSerial(function (err, serial) {
                      result.push(serial);
                      i += 1;
                      finder();
                  });
              }
          };
  
          finder();
      }
docs: Returns the serial numbers of all attached BlinkStick devices.
  
  @static
  @method findAllSerials
  @param {Function} callback Callback when all serials have been collected
  @return {Array} Serial numbers.