... removeable battery 1) 2.1 powerful bass2) Play music from USB,SD/MMC card ,support MP3 format3) With AUX port,also ... apply to PC, mobile phone ,MP3, MP4 etc.4) High-sensitive FM radio (optional)5 ... 5V 8) Frequence response: 100Hz-20Khz9) SNR: ≥75dB10) Power supply: USB port, Li-ion battery or DC 5V11) Product size: 220 ...