When it's got enough charge, or you're using a proper battery (instead of relying on the sun charging it), the Fairy Jar is a great thing to have on a window sill. However, since I bought this for a Christmas present, there is simply not enough light during the daytime to power this up for the evening. The most it manages are a few feeble pulses now & again.. and that's it. I'm hoping the summer sun will give us the power it needs for us to enjoy it, without having to stick in a proper battery (which will last about 2-3 days).