The SP-900BT (black finish), its first portable Bluetooth speaker designed to give you unparalleled wireless mobility. The SP-900BT features a built-in lithium battery and works with any Bluetooth-enabled device, so you can use your Bluetooth-enabled smart phone with the SP-900BT to wirelessly play music wherever you go. Additionally, it employs an advanced driver unit that delivers two watts of full-bodied sound quality. The SP-900BT utilizes a built-in Li-ion battery for maximum longevity, but when it comes time to recharge the device. just plug it into a USB port and it'll recharge in no time at all. For additional functionality, the SP-900BT becomes a convenient hands-free device for voice conferencing when you connect the device to your smart phone. Simply press the call answer button, and it will automatically switch to hands-free mode. Whether you're seeking a high-quality portable speaker or a competent voice conferencing device for your Bluetooth-enabled smart phone, the Genius SP-900BT truly puts the smart in your phone!