Very nice and fun to play with. One of the batteries with a shiny copper penny or a wad of aluminum foil acting as a pass-through to power the LEDs with just 3VDC. They still shine, but with reduced brightness. So far they have glowed for over 24 hours and are still bright enough to use. Update: After 150 hours of use it's very, very dark but still visible in a darkened room.
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