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.

 

Product model:KS668 -A

 

Functions :

1. The transmitter can be recharged in the host box and earphone can be locked in it ,which is easy to manage.when locking, naughty children can not open to change the frequency.

2. Built-in trasmitter charging function,to ensure access to electricity in any time and when the battery gets full, the charger will cut off automatically.

3. Has the functions of audio output, input,high and low volume ,digital reverb.

Can be upgraded to dual-band receiver KS-668 AB type,which is best for interactive teaching.

4.The standard receiving area is 200 sqm, outfitted two speakers, the maximum power is 100W.

5. The enhanced receiving area is 400 sqm, outfitted four speakers, the maximum power is 200W.

Specification:

Weight: 6.5kg

Dimension(L*W*H): 10.04''x3.27''x14.30''( 255x83x363mm)

Frequency Range: 20Hz~20KHz

Reception Angle: 360 degrees

Power Requirements: 220VAC  50Hz

Reception sensitivily: > 85dB

Signal-to-noise :> 80dB

IR Receive Frequency: 2MHz (encrypted)

Infrared Ray Wavelength:850nm

Wired microphone interface: Φ6.35mm

 

 

 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.