The SuperSonic Wireless Portable Bluetooth Speaker Blue Seamlessly Stream, Share Music Anywhere Built-In Bluetooth Receiver Allows You to Wirelessly Connect to Bluetooth Enabled Devices Speakerphone Allow You to Take Calls with the Touch of a Button USB and Micro SD Inputs: Allow You to Play Non-Bluetooth External Devices 2 Way Speaker Connection: Wirelessly Link 2 Speakers at the Same Time to Maximize Your Listening Experience 3.5mm Auxiliary Input to Connect Wired External Audio Devices FM Radio Built-in Lithium Rechargeable Battery Built-in Bluetooth V4.2 + EDR Transmission Distance: 10M Output Power: 4? 1 x 5W Playtime: 3-4 Hrs. S/N: ?85dB Distortion: ?0.5% Charging Time: 3-4 Hrs.