This is an FM transmitter for iPods made by BUFFALO. It is compatible with iPods equipped with a dock connector. It has an auto function that automatically sets the optimal frequency by long-pressing the auto button. This is a junk item. The cord on the socket side that plugs into the cigarette lighter has deteriorated over time, and while it hasn't broken, it is slightly damaged. I have confirmed that it works, and it connects and plays sound, but there is poor contact, causing the sound to become quiet or cut out due to vibration. Please check the condition of the cord in photos 4 and 5. Please consider and purchase this item with the understanding and acceptance that it is a junk item. Basically, we cannot accept claims, returns, or refunds after purchase, so please refrain from purchasing if you are sensitive or looking for a perfect product.