wireless speaker

Speaker-RS40U

Features:
      1.90903 RS40UB wireless speaker set remote to control system.
      2.Plug and play
      3. Has the independent volume control ,and easy to operate.
      4.It is applicated in the classroom of 50-80 persons , distance up to 100feet(max) can receive the signal.
      5. Wireless install,just turn on the power.
      6. Has the functions of U disk,SD card ,Bluetooth.  MP3 and audio source input   
      7.A group of out-fitted wired microphones input.
      8.Frenquency 40.66MHz,or 49.86Hz.

Characters:
     High Security and String-frequency Resistance
     Interference Resistance
     Better antihowling performance
     Better Mobility

Power source:
 DC12V  1.2A  Adapter
 C size battery R14*8
 Power output:12 watts max