They claim the strips interact with the body's energy, as some advanced form of acupuncture. While this is clearly a scam (based on the misdirection in the demonstration video), the theory it exploits is interesting.
Traditional science explains this "life force energy" as low luminescence photons emitted from biological cells resulting from some excess thermodynamic breakdown. The more biophotons from a cell, the more unhealthy it is based on it having more free radicals.
Some researchers (professors, PhDs) believe the low light has some type of macro coherent field (for cellular communication) that relates to the health of our body. This "light" is the so-called human aura but it can be seen with test equipment like PMTs which can detect individual photons. However, most scientists believe it is just excess energy.
I have seen a glass disc that can allegedly interact with this field have an amazing effect on plants but never seen any real proof. There is a cool particle physics model that explains how it could work -
http://www.tachyonmodel.com
(Trying to not let the scam artists dilute interesting science.)