ED (Light Emitting Diode) is on top of the device:  This light is blinking in a floating frequency sequence.

03.  The AO 2000 Water Optimizer
The AO 2000 is designed to produce living water.  Put up to 1 gallon of spring water, well water, or previously purified tap water, onto the stainless steel plate of the device.  You taste a significant difference after a few seconds, the time it takes to reconstitute the original characteristics of water, as if it just came from a mountain spring.  To be fully charged with Chi energy, a cup of water needs to be there for about 30 seconds, one gallon about 5-10 minutes.  Be sure not to use industrially polluted tap water.  filter it first or purchase good drinking water.

(1) Power Jack   
(2) LED (Light Emitting Diode): 
This light is blinking in the pre-set frequency of 7.83 Hz.
(3) Top Plate:  Put there water, drinks or food, cosmetica, etc. -- more to come!