Christmas promotion gifts speaker K9

Christmas promotion gifts speakerFull Metal Jacket, abrasion resistance,Anti-scratch stylish beautiful, elegant Honesty bass, clear treble ultra-long standby, up to 30 hours playing PTT function keys Input power:  3W Frequency response: 75HZ-20KHZ SNR: 90DB Speaker: 1.75 inch 4 3W Power input: DC5V LINE IN connector: 3.5 Interface music formats: MP3, WMA, WMV, ASF

speaker with sd usb