Note: This AMH hand controller comes standard with the AM3 and AM5 mounts. It is offered here just in case you have lost or damaged your controller. The rocker-style hand controller for the AM3 and AM5 Harmonic Mount can be used to control the mount by pushing the rocker in multiple directions. 1. Light Indicator: When the light is on, it means your mount is in HIGH sidereal tracking rate. When off, the mount is tracking on LOW. 2. Directional Control Joystick: Pressing down on the joystick knob switches between high and low slew speeds. Tracking rates for low speed are 1, 2, 4, & 8 times, while high rates start at 20 and go up to 1440x. Slew speeds are infinitely variable through the movement of the joystick...light touches for low speeds and a good push moves the mount at higher slew speeds. 3. Tracking Button: Click to enable or disable tracking. 4. Cancel Button: Click to cancel the current function. Press for 3 seconds to GOTO Home position.