The Wireless Visible Flashing Light and Audible Alarm is used in conjunction with wireless transmitter TL-2016REV supplied in the wireless System SC2029. This system comes with a wireless audible alarm receiver TL-2017REV. The 2007-ECA can be used in conjunction with the TL-2017REV in the system or it can replace the TL-2017REV (You must call to substitute the 2007-ECA for the TL-2017REV in system SC2029). It has a large yellow flashing light in the center and when activated by the wireless transmitter will flash and sound a loud audible alarm. The alarm has a volume control or can be silent. The 2007-ECA can be placed on a wall, ceiling or any place convenient to the caregiver. The 2007-ECA is powered by 4 D size batteries (not included) or by an AC adaptor AC-03.