This small keychain gives a little bit of light. Sufficient to be able to find your keys in the dark (or any other object). The fun thing is; you don't need a battery. Nor does the Trigalight need to be ' charged ' by keeping it in the light. It is powered by a minute amount of tritium (a hydrogen isotope). This is very low level nuclear (absolutely harmless!). The radioactive decay transmits an ionizing radiation which is used to generate light. This technique is also applied in some exclusive watches. The amount of light that the Trigalight gives, can be well compared with these.
Perhaps it is too complicated to explain the exact chemical operation of the Trigalight. It's important to know that the Trigalight will work for about 15 years without ever needing a battery. Safety is also guaranteed.