Listen to pristine streaming audio from your phone, computer, or tablet. The on-board microphone provides clear, hands-free communication. A usb charging port allows you to keep all of your devices powered up. Wireless check in gives you effortless pairing with nfc equipped devices. A built-in aux jack makes this speaker compatible with any device with a headphone jack. The built-in rechargeable lithium ion battery lasts for seven hours, and apt-x and dsp audio enhancement technology allow for optimum audio playback.