FlashEnhancer: Flash LED alerts to the iPhone 4 (Cydia)

IOS 5 will flash LED notification using the back of the iPhone, when they call you, when you receive an email, etc.

With FlashEnhancer can do the same on an iPhone with IOS 4 4 +. You can configure the settings of your iPhone applications make use of Flash, you can set the amount of light, you can select whether locked or only unlocked works, you can even select shine when you battery is low (although this is more than warn you spend even more battery life).

You can download it for $ 3 in Cydia.

Need to be jailbroken.