From Old-Computers.com:  A classic pong from Roberts with four games (hence the name of the system) and detachables paddles. Apparently made in Japan.

The two paddles can be attached to each side of the system, or taken apart. There are only equiped with a unique dial. The general cosmetic design of the Paddle IV looks like the Commodore 64 one. Round edges and beige/creamy color. The games selection is made with a knob...

PROMOTIONAL CATCHERS:
- Featuring 4 games with detachable remotre control
- Automatic on screen scoring
- Simply attached to your black & white or color TV set