for classroom infrared wireless teaching speaker(KS668-A).infrared wireless disign is beneficial and harm to human

for classroom infrared wireless teaching speaker(KS668-A)

Functions :

*The host machine adopts wall-mounted box-type design. Transmitter and accessories can be stored in the chassis, the transmitter can be recharged in the chassis, is equipped with mechanical door locks to facilitate the classroom when there is no multi-media equipment rack managementI

*Along with audio input, audio output all the way, a group of wired microphone input, master volume and high-bass independent adjustable, with digital reverb function

*Can be extended to apply to two or external receiver to enhance the reception or upgrade to a dual-frequency machine

The standard KS-668 ,the received area is 200 sq.meters,outfitted two speakers, the max power is 100W.

The enhanced KS-668 ,the received area is 400 sq.meters,outfitted four speakers, the max power is 200W.

Specification:

*Host Machine Weight:6.5KG

*Dimension(L*W*H):255mm*83mm*363mm

*Outpower:50W       Rated Speaker Impedance:8Ω

*Speaker Weight:2.7KG   Frequency Range:50Hz~20KHz

*Speaker Installation:wall-mounted

*Power Requirements:220VAC  50Hz

*Reception sensitivily: ≥85dB

*Signal-to-noise : ≥80Db

*Reception Angle:360 degrees

*IR Receive Frequency:2MHz (encryption)

*Infrared Wavelength:850nm

*Wired microphone interface:one 6.35 phone jacks

*Audio input interface:RCA-2

*Audio output interface:RCA-2