Peripheral Device Confusion gaming computer builder

I'm studying at TAFE in Western Australia and i have got every question right on my assessments except for one question, which i have gotten wrong on two attempts (one more wrong attempt and i fail the whole unit). So i was hoping someone here might be able to enlighten me to the correct answer.

Which type of Peripheral device would be the MOST appropriate choice for someone wishing to give a presentation (including PowerPoint) while still being able to move freely around the room (up to 10m from the presentation PC) and continue to change slides?

Wrong answers so far: Wireless Mouse and Presentation Clicker

Thanks

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