Seek is a button used to switch radio channels. When you want to switch channels, just press it and you can easily do so. The buttons on the car's CD player include: MUTE for muting, MODE for selecting the mode, AMS for adjusting the volume according to speed, VOL for controlling the volume, BAND for choosing the channel, SCAN for searching for radio stations, SEL for making a selection, TUNE for choosing the sound effect, INT for previewing, RPT for repeating, and RDM for random playing. In addition to playing music by inserting CD disks, you can also connect to Bluetooth, use a USB or AUX audio line to play music.