transducers
No, a voice synthesizer is an output device. An input device is anything that accepts information, these include keyboards, mice, microphones, webcams, ect. An output device is something that gives you information, some examples of output devices are computer screens and speakers. Since a voice synthesizer uses the speakers it is an output device.
It depends on what type of sound device you buy. Some have speakers while others don't.
You don't!
Speakers and Headphones are output devices. A microphone, sometimes integrated with speakers, is an input device.
The generic name is "input device". Examples include keyboards, touch pads, mice, microphones.
Yes
They pair with a Bluetooth device, and that device transmits a signal (a type of digitized radio wave) to that device.
No, it works on electro magnetic radiation.
mechanical energy-electrical energy-mechanical energy
A Microphone
A Microphone does not output sound. It accepts sound. It is an input device.
Radio, electric bell, speakers, motors, generators, microphones etc.