ZTW 35A Brushless ESC for RC Airplanes & Helicopters Perfect for mid-size scale, sport or 3D airplanes The internal BEC and low-voltage cutoff settings make it ideal for use with 2S (7.4V), 3S (11.1V), or 4S (14.8V) Li-Po batteries Will auto-detect the number of lipo cells in your battery and set the appropriate cut-off voltage without any programming needed A variety enhanced performance and safety features, including super-smooth and accurate throttle linearity, extremely low internal resistance, auto throttle shutdown if signal is lost, thermal overload protection, and more Includes advanced programming options: motor brake, battery type, low voltage cutoff threshold, timing setup, soft start, governor mode, frequency, low voltage cutoff type