The EBow or ebow is a brand name of Heet Sound Products, of Los Angeles, California, for the original type of monophonic handheld string resonator, invented by Greg Heet in 1969, first introduced in 1976, and patented in 1978. The name Ebow stands for "Electronic Bow" or Energy Bow) (often spelled E-bow in common usage). The EBow is a battery-powered electronic device for playing the electric guitar. The resonator uses a pickup - inductive string driver - feedback circuit, including a sensor coil, driver coil, and amplifier, to induce forced string resonance. The Ebow brand resonator is monophonic, and drives only one string at a time, producing a sound reminiscent of using a bow on the strings.
In 1976, Heet Sound introduced the first hand held electromagnetic string resonator, at the NAMM Show. It featured an internal, string vibration triggered automatic power switch, a chromium plated ABS plastic shell, a red LED power indicator, and a police-style form fitted black leather holster, embossed with the Ebow logotype. In later years, five subsequent Ebow models were introduced, all of which consisted of internal variations of the original Ebow circuit and actuator coils, as well as color changes to the original plastic shell and Ebow logotype, both of which remained essentially unaltered since the introduction of the Ebow, with the exception of the addition of an external power switch on the back. The latest Ebow model is the "Plus Ebow", which is switchable between "standard mode" and "harmonic mode".