These bulbs let you customize the look of your car's console lighting! This is the lighted switch below your stereo that control's your interior ceiling light.
*note* These bulbs can also be used to replace the lights used in your smart's speedometer and tach/clock pods, but we do not recommend them for this purpose. We've found the bulbs break quite easily when trying to install in these applications, and it is possible to cause damage to your speedometer circuit board if you are not very careful when inserting the bulbs. As well, they don't fit perfectly and can vibrate loose. These are the same "509T" bulbs that have been sold in the UK and Europe for years as the appropriate replacement bulb for this application, but that is not correct (the base is quite different). At one point we sourced out the "proper" replacement bulbs and found they still break too easily - right shape, but low quality. There is no supplier of coloured bulbs that are entirely appropriate for this purpose. Use caution if you decide to do so.