Features: 1. Bass 3D Surround Sound, Skilled Tuning After Hundreds Of Continuous Polishing, Tuning, So That The Sound Level Is Clear, Powerful, And Strive To Approach The Perfect Tone. 2. Bass Booster Technology, Compound Bass Circuit Design + Double Diaphragm Resonance Structure Design So That The Small Speaker Bass Surging Powerful, Virtual 3d Surround Sound. 3.Bass Strong, Full Tone, When Playing Music, Bass Radiator Continuous Vibration Backward Work With The Speaker Unit To Form A Phase Repeatedly Pressurized, Thus Forming A Geometric Multiple Of The Bass To Strengthen, So That The Bass Is More Powerful And Elastic Sound Overall Tone Performance Will Be Thicker. 4. Small Volume, Volume, Miniature Appearance, Small Size, Palm Size, Into The Backpack To Carry With You, So You Can Hear The Music Wherever You Go. 5. , Quietly Enjoy The Music, Feel The Beauty Of Life Enjoy The Slow Life. 1. Speaker Specification: 2inch 4 3w 2. Frequency Response: 150Hz-20KHz 3. Rated Power: 3W x 2 4. Impedance: 4 5. Power Supply: USB DC 5V 6. Channel: 2.0 Channel 7. Input Port: 3.5mm Audio Port, USB Power Supply Interface note: Sold as 1 pair of 2 Size: 9.3 x 9 x 10.4cm Material: ABS+PC Colour: blue Package Contents: 2 x Speakers 1 x Usb Power Line Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.