This is the most often used throttle for customers with SRAM Grip Shifters. This Throttle comes with 3 LED's that indicate the charge of the battery pack. The LED's indicate Power On, High Power, and Low Power. This throttle also comes with a second hand grip. You install this Thumb Throttle on the Handle Bars to control the speed of the motor. The STB-02-36V can only be used with a 36V Battery Pack.