The Afterglow Solar Bottle Lantern Kit allows you to reuse old bottles in a fun, creative, and eco-friendly way. These solar lights will provide thousands of hours of accent lighting in your garden or yard. The Afterglow Solar Lights are weatherproof and suitable for year-round outdoor use and constant enjoyment. Feel free to use this indoors as well, provided they get sufficient sunlight! The Solar Lantern Kit has a built in light sensor and will only turn your solar lights on when the light begins to fade. You can expect up to 5 hours of charge with a full day's worth of sunlight.