That's a new design Portable PA system, Wireless Amplifier
SPA-1075
Specification:
Speaker: 8"
Rechargeable, (endurance 4 hours)
With VHF wireliess transmitter & microphones
USB, SD card socket with controls
Bass, treble, reverb controls
Input: 2mic, 2antenna, RCA, 12v, 3A,
Output: RMS75w
Frequency response: 40Hz-16KHz
Output: 3v500mA
Superior audio perfromance with perfect function, low noise and full-power, fill-spectrum transparent audio and natural sound with selectable echo effects;
Convenient portable PA package with carrying/pulling handle and wheels for easy transport