Seek is a button used to switch radio channels. When you want to switch channels, just press it once and you can do it. The buttons on the car's CD player include: MUTE (mute), MODE (mode selection), AMS (auto volume control), VOL (volume control), BAND (channel selection), SCAN (radio search), SEL (selection), TUNE (sound effect selection), INT (preview), RPT (repeat play), and RDM (random play). Not only can you listen to music by playing CDs, but also by connecting to Bluetooth, using a USB or AUX audio cable.