This is the Traxxas E-Maxx Pins Axle (2.5x12mm) (4) (4955).
This is built into the K4020U MOSFET amplifier in order to display amplifier power output. The meters are mounted behind the correct scale which is also illuminated according to the speakers connected to the amplifier (4 or 8 ohms). When the amplifier is switched into a bridge configuration then both meters may be connected in series.
Presenting the Hercules Unbreakable Helipilot 3. 5CH 2. 4GHz RC Helicopter 3-Pack Bundle! This RC helicopter already has all the awesome features of the Unbreakable Hercules only this time it comes with an even more awesome Helipilot Joystick! This Joystick has full directional control with a turbo, left/right trim command buttons on the joystick.