IWA-200 / IWA-220 --Products link-- IWA-200/IWA-220 IWA-300/IWA-320 IWR-200/IWR-220 VRA-200/VRA-220   Infrared Wall-mount Amplifier System       Amplifier Handheld Beltpack   IWA-200/IWA-220 system features   • State-of-the–art Infrared (IR) technology assures Interference-free, Eavesdrop-free secured wireless applications. • Compander audio circuit improves signal to noise ratio and reduces background noise. • Pilotone squelch mutes the receiver at standby stage. • Excellent high fidelity and dynamic range – ideal for speech applications. • Infra-red does not penetrate wall. Safe and cost effective alternative to Radio Frequency (RF) wireless microphone systems in multiple adjacent rooms application. • No complicated frequency allocation and license problem. • Just one frequency is adequate for multiple adjacent rooms application. Transmitter is free to move from room to room. • Built-in IR sensor. Extra port for optional external IR sensor for wider coverage. • Dedicated drop-in chargers for handheld (HC-20/HC-33) and bodypack (HC-33/HC-37) transmitters. • Battery charging station (HC-10) for up to 4 pieces of AA size NiMH rechargeable batteries. • Detachable IR emitter (IT-10) for more efficient IR radiation. Suitable for neck worn by lady teachers. • Detachable IR emittr (IT-11) with 4-pin mini-XLR socket for connection to headset microphone       Benefits   • An effective classroom amplification system helps improves academic performance. • Many times improvement in teacher’s voice level over ambient classroom noise. • Teacher’s voice will be heard by every student at the same level no matter where the teacher is standing or where the student is seated. • Teacher’s voice level can be amplified with little or no reverberation. • A new tool for improving word recognition. • Studies prove that students with normal hearing as well as mild hearing loss achieve higher academic scores. • When teacher’s voice is heard loud and clear, classroom stress is lowered and fewer behavior problem arise. • No more shouting. An effective voice Saver Device for teacher.