The chameleon is a clever creature that can change colour at will, and guess what? There"s now an iPhone case that does the same! The iChange is a series of smartphone covers that change colour when exposed to UV light. So you might be holding your phone inside and it"s white, then step outside and it turns blue. It"s amazing! There are four styles to choose from, each with a different colour spectrum. This item changes from BLUE TO PURPLE. There are also versions for other models of smart phone. You don"t need a heatwave for it to work, just a bit of sunshine!This fits the iPhone 4 and 4S, measuring approx 6 cm x 11.5 cm x 1 cm.