Active Professional Indoor Outdoor wireless speaker( FVW01) High Security and String-frequency Resistance Interference Resistance Better antihowling performance , Better Mobility Frenquency : 40.66MHz, or 49.86Hz. Packaging Details: Packing box( 2sets boxes/ ctns) : 44.5* 23* 45cm color box( 1set) : 21* 21* 42.5cm 20' feet: 1300sets 40' feet: 2700sets 40' HQ: 3000set Our indoor outdoor wireless speaker has Low wireless cost, Transmitting distance Up to 100feet ( max) 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 install, just turn on the power. 6. has the functions of audio output, input, high and low volume, and digital echo. 7. A group of out-fitted wired microphones input. Panel with blue LED mood-light illuminate the speaker for use at night. Simply connect the transmitter to any audio device with an output jack using the Supplied cables and turn on the speaker then enjoy your favorite audio anywhere around the house or outside. Manna Su Mobilephone : 86+ 18925385060 QQ: 613785758 Skype : Manna-fevma