Hearing aids work by amplifying sound through a three-part system: the microphone, the amplifier and the speaker.

Compared to conventional polycrystalline silicon (poly-Si), re-crystallized (RC) metal-induced laterally crystallized (MILC) poly-Si possesses improved mechanical and electrical properties. RC-MILC ...

Power Amplifier Speaker with microphone and line inputs Speakers with a built-in amplifier that has inputs jacks for microphones, audio tape recorders, and other sound sources. This unit is best used ...

Speakers with a built-in amplifier that has inputs jacks for microphones, audio tape recorders, and other sound sources. This unit is best used for outdoors use.