Frequency Response: 100Hz - 20KHz Signal to Noise Ratio(SNR): >=89dB (Amplifier) Features: Expandable design with high quality sound Standard 3.5 audio plug for easy plug and play Perfect size for smart phones and portable devices Power Supply: 3.7V/250mAH Package Contents: MSP50R Portable Speaker Multi-Function USB Cable Quick Start Guide Parts: 1 year limited Labor: 1 year limited