Ten years of glow no batteries needed the nitestik safety marker uses photoluminescent pigment technology which absorbs light during the day to glow freely at nightnitestik use state of the art photoluminescent pigment technology to produce a light source that requires no batteries and last up to 10 years inside this safety marker is a rare earth activated alkali earth aluminate silicate which absorbs both natural and artificial light to continuously give of light for over 12 hours in the