TypeMini speaker Total Power Output2 x2W SNR > 85dBA Input Sensitivity600±50mV Frequency200Hz-20KHz Power SupplyBuilt-in Li-ion Battery / 5V DC Dimension150 x 62 x 31 mm Weight0.215KG Tap and connect : Designed with NFC for seamless compatibility with your smartphone. Connect through Bluetooth 4.0 and experience clear sound without complications. Plug in any device with 3.5mm AUX to experience quality sound. Or upload your music to a micro SD card and browse through thousands of songs. Hands free calling : The MP211 has a built-in microphone ideal for answering calls. Control songs, volume and calls from the buttons located on the speaker. Developed with li-ion battery that last up to 10hrs, there is no reason to disconnect your phone.