Spotted on a Japanese website, the description of this Space Invaders alarm clock relies on my knowledge of the Japanese language – so I take no responsibility if I get it a little wrong!
But from what I can work out, it’s just an alarm clock shaped like a Space Invader (no radio or playable game sadly), with the alarm being a "retro" sound (which I’m guessing is the sound of the old arcade game). And when the alarm goes off, an images of the Space Invaders attacking appears on the screen until you knock off the alarm.
Battery operated, it’s available in Japan only right now, priced at 3,800 Yen, which is around £17.
Product page (in Japanese)