ION Audio Cassette Adapter Bluetooth | Bluetooth Music Receiver for Cassette Decks Turns your car's cassette deck into a Bluetooth music receiver Enables hands-free phone calls using the built-in microphone and your car's speakers 4+ hours of use with built-in rechargeable battery Powers on and off when inserted into and ejected from deck USB charging cable included. Transforms your cars cassette deck into a Bluetooth music receiver Cassette Adapter Bluetooth can only charge while it is removed from a cassette deck and not being used NOTE: Check Instruction video before use. Refer to the PDF attached below in Technical Specification for User Manual