Product appearance is novel, fashionable, lightweight, so that everyone in the wireless field solution in the past complicated Features: 1.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 ,and the area of 35sq.meters can receive the signal. 5. Wireless ...