2.0CH Multimedia Mini Speakers for PC and NotebookRange for electron volumeattenuation,upgrade 0db — -78dbStatic state waste power ≤6mAOutput power 2.5W×2Signal input 3.5mm headphone plugImpedance  4OhmS/N Ratio≥60dbIsolated rate ≥45dbSpeaker Unit 3070×2Speaker size  122×43×80mmOperate voltage 3.7VPower supply  Polymer charge batteryBattery Caability 160mAhCharge power USB 5VCharge  electri  current  50-5mACharge time  3-5hStatic state waste power ≤6mAStatic state standby time  12hSleeping standby time ≥48hS/N Ratio  ≥63db Isolated rate  ≥45db Speaker Unit   20mm/4Ohm/2W Speaker size   33×36mm

usb mini speaker protable speaker