Check out this video for FREE PROMO CODES: http://budurl.com/ravesvid**Requires the iPhone 3GS to use the compass-based effects**(Otherwise, it operates like the original Rave Light)The hit app Rave Light now comes with its own version for the iPhone 3GS."and THIS will be the reason I get an iphone..." - Reaction on YouTube to original Rave Light.While as the original Rave Light works using the built-in accelerometer's x, y, and z values to make RGB combinations, this app uses the built-in magnetometer (i.e. compass) to generate an HSB combination.Point the device North to get Red. Point it South East to get Green, and South West to get Blue.Cheaper than a pair of glow sticks.