Indicating light towers; indicator lights; indicating lights; signaling light towers; signaling lights; revolving warning lights; signal lights; flashing lights; emergency black out lights; burglar alarm lights; audio synthesizing alarms; electronic sound alarms; devices visually indicating warning information; transmitters for wireless communications; receivers for wireless communications; repeaters for wireless communications; transmitters for wire communications; receivers for wire communications; repeaters for wire communications; transmitters for infrared communications; receivers for infrared communications; repeaters for infrared communications; video frequency devices and apparatus; cameras; electronic displays, namely, digital signage; downloadable music files for use in conjunction with light towers being stacked warning lights that indicate a problem or malfunction of a machine by means of flashing, continuous lighting, alarms, buzzers, beeping, sirens, songs, and/or voice; downloadable music files for use in conjunction with light towers being stacked warning lights that signal a problem or malfunction of a machine by means of flashing, continuous lighting, alarms, buzzers, beeping, sirens, songs, and/or voice; computer application software for indicating light towers; computer application software for signaling light towers; data capture devices for indicating light towers; data capture devices for signaling light towers; data storage devices, namely, blank CD-ROMs and DVDs; blank USB flash drives; blank secure digital SD memory cards; bar code readers; computers; road signs, luminous or mechanical; burglar alarms; security and fire alarms; temperature sensors; humidity sensors; pressure sensors; level sensors; distance sensors; proximity sensors; optical sensors; position sensors; acceleration sensors; alarm sensors; gas sensors; infrared sensors; motion sensors