Three wire throttle commonly used on electric scooters.

Usually contains a black, red, and green wire. The supply voltage is via red and black wires and is usually around 4 volts. Green wire voltage increases as the throttle is turned.

This throttle is technically referred to as a Hall Effect type.

Specifications
Inner Diameter: 23mm
Wire Length: 45 inches
Used on 12v, 24v, 36v and 48v vehicles
Hall Effect

Supported Models
X-Treme Several Models, SUNL Several Models, Various unlisted makes/models, Roketa Several Models, Boreem Jia, E-scooter, Electra Scoot-N-Go