Lenovo 500 Bluetooth Speaker Get 270 Degree stereo sound while in stand mode or great sound in any mode. An embedded microphone allows the speaker to be used as a speakerphone Features a rechargeable 1800 mhA battery and delivers up to 4-hours of playback. Turn it on and turn loose your favorite playlists Built with CSR 4.0 Bluetooth technology and featuring support for NFC connectivity, this speaker is truly a portable device. Unplug and go.