The iSound Crescent Bluetooth speaker is an ultra-compact high performance wireless speaker which allows you to take your audio wherever you go. Use your Bluetooth enabled smartphone, tablet, MP3 player, laptop and more to listen wirelessly to your favorite music. If your music playing device is not Bluetooth enabled you may still connect to the Crescent speaker using the included 3.5mm audio cable. The Crescent speaker also offers very convenient additional functions such as the built-in microphone and controls in order to take speakerphone calls. Also, using the AUX out port and the included 3.5mm audio cable, you can use this speaker as a Bluetooth receiver to connect to your non-Bluetooth enabled home stereo wirelessly. Simple connect your home stereo to the speaker via AUX cable, then stream music from your smartphone (or other device) to the speaker via Bluetooth and listen to your audio via your home stereo! This speaker has a 33 foot transmission range and its 600mAh battery lasts for up to 4 hours or continuous playtime. The iSound Crescent speaker is the perfect combination of fantastic style and great functionality!