infrared wireless dual -band audio speaker system(

infrared wireless dual-band audio speaker system(ks668-ab)Here is the Infrared Advantages: 1.Infrared light transmit signal,High Security,Interference Resistence and Against String Frequency Infrared (IR) is short-range wave, cannot penetrate walls,which solve the string problems between the classrooms. It can realize that many sets of equipments used in many rooms simultaneously, so it is safe and has good isolation. 2.Emitter can be equiped with any receiver,Operate Conveniently We can use the same frequency in the different rooms beacause of no string frequency. teachers can use the same microphone in different rooms ,so it is conveniet to manage. 3.Using light refraction to achieve 360 ° sensing in 30 m, it there are barrier and turn of the teachers ,the transmitting distance can be 10m. 4.Away from the electromagnetic radiation and interference, create a healthy, environmental -protected, health, green campus. Characteristic: 1. Suitable for classroom which already has speaker and amplifier and now wants to upgrading into infrared speaker system. Which saves money in the upgradation. 2. Has two group audio frequency inputs, a group audio frequency output, a group of wired microphone input, amplitude of audio output can be adjustable. 3. Can use four receiver to strengthen the receiving effect, the expansion area could be 400 sqm. Specifications: Weight:1.6KG Dimension(L*W*D): 8.27''x7.68''x1.97''(210x195x50mm) Output Range:500mV Reception Angle:360 degrees Power Requirements:220VAC 50Hz Reception sensitivity:85dB Signal-to-noise :>80dB IR Receive Frequency:2MHz (encrypted) Infrared Wave length:850nm Additional function:a group of out-fitted wired mics Wired microphone interface:one 6.35 phone jacks Assembles PA The upgrade host machine 1set KS-HG transmitter 1 set Out-fitted receiver 1set (including15m signal line) there are two kinds of mirophone for your reference, handhold MIC and chest-worn MIC with collar-clamp or headwear. You can choice the one u like.