NODE+ (wireless sensor platform) is a first-generation handheld sensor measuring 1 inch in diameter and 3.75 inches wide that communicates wirelessly through low-energy Bluetooth 4.0 with Apple iOS devices.NODE+ has been attributed in the media as a “Swiss Army knife of sensors,” similar to the “tricorder from Star Trek,” and as a “powerhouse of quality sensors” that can “measure anything.”As of September 2014, 16 interchangeable sensor modules were available for purchase that can detect color, gases, ambient temperature, barometric pressure, motion, surface temperature and other qualities.Mobile applications that display the data transmitted by the NODE can be developed through an open application programming interface (API), although mobile app developers must obtain a commercial license from Variable Inc.