The TDK Life on Record Universal Charging Speaker pairs high quality stereo audio with ultimate versatility. The built-in universal line-in jack allows you to connect and play music from any digital music device that has a headphone jack. As long as the speaker is plugged in to AC power, the USB charging port ensures your device won’t lose power while you listen. If it’s portability you want, this little speaker takes big sound to go with 4 AA batteries. With two active drivers and two passive radiators, you’ll get incredibly rich sound wherever you go.