B28S the versatile Speaker allows you to connect any music sources through Bluetooth V3.0+EDR, AUX-IN, USB drive and FM. You can simply changes modes by press of a mode button. It will orally announce the current mode for your convenience. Its comes with two powerful 5W (RMS) inbuilt speakers to offer fantastic sound output at low-min and high frequencies in the range of 85Hz to 20KHz and Signal to Noise Ration of 90dB. It has powerful grill body which packs the punch across the audio spectrum.