code: function (id) {
          // Stop javascript timer & remove from timer list
          if (id && timers[id]) {
              window.clearInterval(timers[id].timer);
              removeListeners(timers[id].listeners);
              delete timers[id];
  
              if (eventTimerId && Object.keys(timers).length === 0) {
                  // No more watchers, so stop firing 'devicemotion' events
                  window.clearInterval(eventTimerId);
                  eventTimerId = null;
              }
          }
      }
docs: Clears the specified accelerometer watch.
  
  @param {String} id       The id of the watch returned from #watchAcceleration.