A keychain-sized device that lets you play the Space Invaders game. - Model: Space Invaders - Brand: HIRO - Year of manufacture: 1978 - Color: Blue - Size: Keychain size Functionality has been briefly confirmed, and it powers on. Please note that batteries are not included. There is some wear and tear, but it should not affect gameplay. This is a used item, so please understand this before purchasing. If you have any questions, please feel free to comment. Thank you for looking.