What are these?
headphones
What's this?
printer
What are you doing?
I'm downloading a song/video/movie, etc.
What's this?
keyboard
What's this?
laptop
What's he doing?
He's surfing the internet
What's he/she doing?
He/she is texting a friend.
What's this?
mobile phone
What's this?
camera
What are they doing?
They are taking a selfie.
What's she doing?
She's chatting online.
What's this?
tablet
What's this?
microphone
What's this?
Game console
What is she doing?
She's talking on the phone.
What's this?
screen
What's she doing?
She's sending an email.
What are these?
speakers
What's this?
mouse