This ION battery is a replacement for the rechargeable battery of the Tailgater, Block Rocker or Mobile DJ by ION (2010 onwards). Easy to replace yourself. A full charge will allow for up to 50 hours of music playing at a moderate volume.
Do you think that the cassette player in your car stereo has become obsolete? ION beg to differ. This tape is really a Bluetooth receiver that takes the music from your phone (for instance) to the speakers in your car.