This stunning clock can be hung indoors or outdoors, the large glowing moon absorbs light throughout the day, either sunlight in the garden, or artificial light and window light in the home, and then begins to glow once it becomes very dark. This clock pairs beautifully with our forest stag mirror. Please note the clock has to be placed somewhere where it receives lots of bright light throughout the day to charge, so near windows or lights in the home, and in sunny areas of the garden, and as it is 'glow in the dark' and not led, it will need to be very dark for you to see the effect, so when using in gardens, placing too near streetlamps, or lighting from the house, where it doesn't ever get totally dark, it might not be as effective. Working clockblack metal finishhuge 50cm diameterrequires 1 x aa battery