Item Type: Bluetooth SpeakerMaterial: MDF+ClothLoudspeaker Size: Approx. 70mm / 2.7inBluetooth Protocol: 4.2Frequency Range: 90Hz-20KHzImpedance: 4Support: Memory Card, USB, AUX, MP3Built in Polymer Lithium Battery: 1500mAh (included) Package List1 x Speaker1 x Manual1 x Charging Cable1[Rotating Button] It is more convenient to rotate to adjust the volume, and rotate to create a new rhythm. 2[Fashionable Look] MDF plus the classic collocation of cloth, the fashionable and beautiful touch buttons are more advanced. 3[Bass Stereo Sound] The 70mm loudspeaker resonates with the diaphragm, making the bass more powerful and penetrating. 4[Play Modes] Bluetooth, memory card, AUX, U disk meet multi scene playback needs, wired and wireless play, good music is not limited. 5[Stable Connection] Bluetooth 4.2, stable signal, strong anti interference, easy to enjoy good sound quality.