Beautiful butterflies that flutter their wings hovering above your favourite flower and occasionally flying all the way around it - simply amazing and looks incredibly realistic! The small solar panel converts the daylight into energy for the butterfly and the brighter the weather the more active her flying is. When the skies darken you can switch the energy source to the backup AA battery (not included) for a constant flying display. Transform your garden to an incredible wildlife nature reserve with the Solar Butterfly and amaze your family and guests! HQRP UV Chain / UV Radiation Tester: To know the Solar UV Index, it is enough to compare the colorchange with the 4 standard colours around. Very light purple: low intensity, UV index 1-2. Sun-protection not necessary. Light purple: medium intensity, UV index 3-5. Sun-protection is recommended. Purple: strong intensity, UV index 6-7. Sun-protection is necessary. Dark purple: very strong intensity, UV index 8-11. This tester shows you the level of UV radiation and helps you protect your eyes and skin from negative sunlight effect, but this metre doesn't show sunlight intensity for solar panels.