• Output : 3W
  
• Frequency Range: 150HZ-20KHz
  
• Charging time : 3.5 hours
  
• Music playing time : up to 9 hours
  
• Rechargeable via standard USB output
  
• Standard 3.5mm audio port allows to add more speakers as an option

Features:

• Resonance speaker, make your desk sing, book sing, glass sing from now on.
  
• Resonant sound is MP3, MP4, iPod, iPhone, handset, laptop, CD/DVD and the ideal companion for all multimedia devices
  
• USB power cord with 3.5mm audio input plug
  
• LED power indicator for power on and charging
  
• Built in, rechargeable lithium battery each full charge can last for 9 hours