Asunflower&reg; Universal Mini Kaidaer Bluetooth Wireless TF Micro FM Music Stereo Speaker SLIVER Bluetooth function. Music: MP3,WMA format available. TF card music playing Audio output jack. Built in stereo speaker. Support Report model: repeat one / repeat all / random / normal Support multi EQ levels: Normal ,Pop, Rock, Jazz, Classic, Country. Support USB 2.0 High speed transmission and USB disc music playing FM radio, Frequency range: 87.5 to 108.0 MHz, and AV cable as a antenna. Support earphone playing(3.5mm Jack) Built in Lithium battery, playback around 5 hours after charging 4 hours. Loud speaker: 1.77 inch(external diameter 45mm) magnetic resistant 4 Ohms