Lazy BoneThe Zenith Radio Corporation created the very first television remote control in 1950 called "Lazy Bone." The Lazy Bone could turn a television on and off, and change channels. However, it was not a wireless remote control. The Lazy Bone remote control was attached to the television by a bulky cable. It turned out that consumers did not like the cable because it caused frequent tripping.
Flash-matic - Eugene PolleyZenith engineer, Eugene Polley created the "Flash-matic" the first wireless TV remote in 1955. The Flash-matic operated by means of four photocells, one in each corner of the TV screen. The viewer used a directional flashlight to activate the four control functions, which turned the picture and sound on and off, and turned the channel tuner dial clockwise and counter-clockwise. However, the Flash-matic had problems working well on sunny days, when the sunlight sometimes change channels at random.
Zenith Space Command - Robert AdlerThe improved "Zenith Space Command" remote control went into commercial production in 1956. Zenith engineer, Doctor Robert Adler designed the Space Command based on ultrasonics. Ultrasonic remote controls remained the dominant design for the next twenty-five years, and as the name suggests they worked using ultrasound waves.
The Space Command transmitter used no batteries; inside the transmitter were four lightweight aluminum rods that emitted high-frequency sounds when struck at one end. Each rod was a different length to create a different sound that controlled a receiver unit built into the television.
The first Space Command units were expansive due to the necessary use of six vacuum tubes in the receiver units that raised the price of a television by thirty percent. In the early 1960s, after the invention of the transistor, remote controls came down in price, and in size, as did all electronics. Zenith modified the Space Command remote control with the benefits of transistor technology (and still using ultrasonics) creating small hand-held and battery-operated remote controls. Over nine million ultrasonic remote controls were sold.
Infrared devices replaced ultrasonic remote controls in the early 1980s.