Clock radios are clocks, alarms, and radios.
Most clock radios have a snooze button, so you can sleep for an extra five minutes.
Cuckoo clocks have a little bird that comes out of a door and says "cuckoo, cuckoo, cuckoo..."
Cuckoo clocks are wall clocks.
Grandfather clocks are tall, and they sit on the floor.
They make a gong sound every hour.
A pendulum swings back and forth to keep time.