EBow

The EBow is an electronic device used for playing string instruments, most often the electric guitar. It is manufactured by Heet Sound Products, of Los Angeles, California, US. It was invented by Greg Heet in 1969, introduced in 1976 and patented in 1978.[1]

An EBow
Using an EBow with a Telecaster

The EBow uses a pickup in an inductive string driver feedback circuit, including a sensor coil, driver coil, and amplifier, to induce forced string vibrations. The EBow is monophonic, and drives one string at a time, producing a sound reminiscent of using a bow on the strings.[2]

The name EBow stands for "Electronic Bow" or Energy Bow (often spelled E-bow in common usage).[3]