Product appearance is novel, fashionable, lightweight, so that everyone in the wireless field solution in the past complicated Features: 1.RS40 wireless speaker set the transmitter,receiver,amplifier,and speaker as a whole. 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 ...