The U-Force was a game controller

Game controller

A game controller is a device used with games or entertainment systems used to control a playable character or object, or otherwise provide input in a computer game. A controller is typically connected to a game console or computer by means of a wire, cord or nowadays, by means of wireless connection...

 made by Brøderbund

Brøderbund

Brøderbund Software, Inc. was an American maker of computer games, educational software and The Print Shop productivity tools. It was best known as the original creator and publisher of the popular Carmen Sandiego games. The company was founded in Eugene, Oregon, but moved to San Rafael,...

 for the Nintendo Entertainment System

Nintendo Entertainment System

The Nintendo Entertainment System is an 8-bit video game console that was released by Nintendo in North America during 1985, in Europe during 1986 and Australia in 1987...

. It employed a pair of perpendicular

Perpendicular

In geometry, two lines or planes are considered perpendicular to each other if they form congruent adjacent angles . The term may be used as a noun or adjective...

 infrared

Infrared

Infrared light is electromagnetic radiation with a wavelength longer than that of visible light, measured from the nominal edge of visible red light at 0.74 micrometres , and extending conventionally to 300 µm...

 sensor

Sensor

A sensor is a device that measures a physical quantity and converts it into a signal which can be read by an observer or by an instrument. For example, a mercury-in-glass thermometer converts the measured temperature into expansion and contraction of a liquid which can be read on a calibrated...

 panels to translate the user's hand movements into controller signals.

From a print advertisement circa 1989:

Introducing U-Force, the revolutionary controller for your Nintendo Entertainment System. So hot, no one can touch it. Now you can feel the power without touching a thing. It's U-FORCE from Broderbund - the first and only video game controller that, without touching anything, electronically senses your every move, and reacts. There's nothing to hold, nothing to jump on, nothing to wear, U-Force creates a power field that responds to your every command--making you the controller. It's the most amazing accessory in video game history - and it will change the way you play video games forever. It's the challenge of the future. U-Force. Now nothing comes between you and the game.

Reception

The U-Force was ranked the eighth worst video game controller by IGN

IGN

IGN is an entertainment website that focuses on video games, films, music and other media. IGN's main website comprises several specialty sites or "channels", each occupying a subdomain and covering a specific area of entertainment...

 editor Craig Harris. MSN

MSN

MSN is a collection of Internet sites and services provided by Microsoft. The Microsoft Network debuted as an online service and Internet service provider on August 24, 1995, to coincide with the release of the Windows 95 operating system.The range of services offered by MSN has changed since its...

 listed it as one of the top 10 worst game peripherals, writing "Second only to the Sega Activator in terms of all-out crappiness, the U-Force also used infrared sensors to create a truly nightmarish controller...'Don’t Touch' said the adverts for the device, in a rare example of an advertising campaign that got it spot on."