A mobile device is normally a pocket sized computer device.
A mobile is basically a hand held telephone that you can take anywhere you go.
A personal digital assistant/pda is a handheld device which can access the internet.
A webcam is a video capture device which is connected to a computer often connected by a usb.
Earphone/microphone sets are a device which you put on as headphones which have a microphone attached. You can normally use these with a webcam to have a video chat.
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