Features: brand new and high quality The USB interface has only power supply function, without USB sound card. Upgrade anti-magnetic technology to avoid current noise. Could be connected with cables. Precautions:It is strictly forbidden to directly connect the audio input of this unit to the external power amplifier port; Please listen to music at an appropriate volume, so as not to damage your hearing and speaker system;Please pull out the USB plug if you don'for t use it for a long for time; Avoid exposure to for sun, rain, water droplets, and avoid long-term exposure to high temperature and humidity;No other items should be placed on the equipment to avoid damage to the machine. Specifications: Material:Plastic Music Format:FLC WAV WMA APE MP3 Signal Shielding:75dB Speaker Size:Approox.313x70x66mm/12.32x2.76x2.6in Rated Power: 5W x 2 Plug: 3.5mm plug (audio) + USB plug (power) Frequency Response: 180Hz -20KHz Power Supply: USB 5V for DC Speaker Impedance: 4Ω Cable length: about 1.5m/59.06in Speaker size: 52mm Number of channels: 2CH Number of speakers: 2PCS Material: ABS+ aluminum alloy Power amplifier chip: TLK5208 THD+N harmonic distortion: ≤0.5% Power supply voltage /current: for DC 5V/1A Light mode: 9 backlight modes, you can turn off the light. Package Includes: 1x Wired Speaker 1x User Manual note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.