1.The small speaker is designed with a Class-G double charge pump amplifier and DSP 3D stereo chip to enhance the audio streaming to break through the limitation of the box size. 2.To strengthen the speaker power, it uses breakthrough vortex modeling design. As a result, the volume is enhanced by 100% compared with ordinary speaker and the ductility is increased by 50%. 3.It also adjusts the low, medium and high transmission gain dynamically and suppresses the distortion to ensure enhanced clarity and fidelity. 4.The improved sound will surely bring you a comfortable listening experience. Specifications: Material: ABS Plastic+Rubber Oil+Cloth Net Color: As picture show Size:120*80*35mm Bluetooth specification: Bluetooth4.2 Transmission distance: 10 meters Speaker specifications: 45mm, 4/3W Amplifier specifications: 4/3W Battery specification: 400MAH Play time: 1-2H Package Included: 1x Bluetooth Speaker 1 x charging cable