points about Stage monitoring for performance

• your audience needs to hear you, and you need to hear yourself. 
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• In the early days of pop and rock bands it was common to provide only front-of-house (FOH) amplification, commonly mixed from the stage by a member of the band (who, of course, couldn't hear the FOH PA properly).
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• No-one is properly in control of what the audience hears.
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• progress has been made and we now recognise that it is essential to have the mix position at front-of-house, placed centrally amidst the audience area
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• Stage monitoring is taken very seriously by top professionals, and should be by anyone working in live performance, right down to pub gig or theatre foyer level

Headphones

Headphones are a pair of small listening devices that are designed to be worn on or around the head over a user's ears. They are electroacoustic transducers, which convert an electrical signal to a corresponding sound in the user's ear. Headphones are designed to allow a single user to listen to an audio source privately without letting anyone else hear your content.

Wireless headphones are headphones that connect to a device, such as a smartphone, stereo speaker, television, gaming console, computer, or other electronic devices without using a wire or cable usually by bluetooth.