Specifications:

• Power Voltage: 3.7V (rechargeable battery)
• Power charging supply: computer USB port
• Battery support: about 5 hours
• USB edition: USB 2.0
• Support MP3, WMA format
• Optional memory up to 4GB
• 16 level volume control
• LED status indicators
• Frequency response: 20Hz-20k Hz
• SNR: >80db
• Speaker Power: 2x15mW