What is it?
It's a mobile phone / smartphone.
What is it?
It's a video camera / camcorder.
What are they?
They are headphones.
What is it?
It's a tablet.
What is it?
It's a (computer) mouse.
What are they?
They are earphones.
What is it?
It's a laptop.
What are they?
They are apps.
What is it?
It's a (digital) camera.
What are they?
They are speakers.
What is it?
It's a webcam.
What is it?
It's a (computer) screen.
What is it?
It's a keyboard.
What is it?
It's a TV / television.
What is it?
It's a printer.