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