The built in solar module charges the battery during the day and when dusk falls the light switches on automatically the sturdy base ensures that it will not fall over when placed outside the tree has 24 leds each with a lovely warm white light colour you can change the petal colour to yellow orange or white which will affect the flower colour the petals are loose in a bag which is supplied with the tree and it is very easy to attach them you can even bend the branches as you wish