... 2. melodious sound 3. great sound 4. USB card,remote audio speaker mini speaker, computer speaker, Selling point:Extendable bass chamber ... USB port: through which you can recharge speaker and input audio, one port is better than two!Anti-slip base: three ... to order. Specifications:Rated power: 2WSNR≥89dBFrequency response: 150-20KHZSpeaker drivers: 3.6 cm, 2W/4ΩOutput: 4.2V/250MASize: 52 ...