If you only have a cassette player in your car, you probably bought a cassette adapter to connect your mp3 player or phone.  This neat hack by the clever Kipkay will help you keep up with the times without shelling out a lot of money by turning this:

Into… (drumroll, please…) this:

The hack involves taking the Bluetooth transmitter from a (used) Bluetooth headset and connecting it with the electronics inside the adapter:

I wish Kipkay provided an alternative way of making the Bluetooth transmitter’s controls accessible, because that’s an equally crucial part of the hack. Otherwise it seems like a straightforward project.

[via Kipkay]