GlowCrosses are made with a scientifically formulated very strong composite that will glow 14 hours in the dark. It only takes a few minutes of sunlight or ambient light to fully charge the special energy absorbing material. Simply mount or place the cross, as it does not require cords or batteries, unlike the solar panel units that have batteries, bulbs and wires that may need maintenance. There are thousands of GlowCrosses in use since 2003. All the GlowCrosses are still glowing with the same intensity and vibrancy as GlowCrosses being proudly fabricated today. Great gifts for weddings, dedications, memorials for people & pets, birthdays and special events or inspirational décor. All crosses are for indoor or outdoor use.