Theta C1x3 and T1 servo set for 700~800 heliTHETA Razor C1 NFC HV Standard Brushless Servo High voltage, High Torque, standard size brushless servo. Ideal for 550 all the way up to 800 class helicopters. Suitable also for airplanes as well as for throttle and steering in cars. 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