TS-RD1 THETA Razor-D1 NFC HV Low Profile Brushless ServoHigh voltage, High Torque, low profile size brushless servo. Ideal for small machines requiring full size servos, but where weight is a concern, such as 500 600 helis. Suitable for 1 10 scale vehicles. The Servos are at the top of their class due to their ability to be fully programmed via an Android NFC enabled smart phone. You can adjust things such as the center point, refresh rate, acceleration, as well as the PID control loop of the servo. You