mb-microtec of Switzerland is the worlds leading manufacturer of GTLS ( gaseous tritium light source). These light sources are totally independent of a battery or any other form of charging and are used for example, by leading optics companies to illuminate scopes and pistol sights.This technology is also increasingly used in the watch business and many brands, including mb-microtecs own line of traser tactical watches,use it to provide superiour night time readability.
www.mbmicrotec.com