The speaker light contains 2 LED lights encased in a clear durable plastic light ring which give off a gentle halo glow and are visible in daylight while not being overpowering in darkness. The rings measure 4 inch in diameter, are 1/4 inch thick and sit on top of the rear speakers. There is no interference with the speaker operation. This unique lighting adds additional visibility to the bike and looks great. Included is an optional 5 inch gasket so this light can be used on a 5 inch speaker. Fits the GL1800 01-12 and GL1500. Four colors available. Pair.