Bluetooth Speaker, UtechSmart Portable Wireless Bluetooth Mini Speaker with NFC Function Enhanced Bass and Mic Speaker System The latest Bluetooth 3.0 (fully backward compatible) for longer standby time; Features Near Field Communications (NFC) technology which allows for easy, one-touch pairing by simply tapping your NFC-enabled Bluetooth smart device on the speaker; Equipped with a 3.5mm audio jack for non-Bluetooth devices. Built-in Li-ion battery means you're free to place your speaker almost anywhere you please, plus the battery can be easily charged via a standard micro USB connection Features clear, full sound and a built-in microphone with CVC background noise reduction for receiving voice calls.