Features: Using BLHELI-S firmware. Super smooth and accurate throttle linearity. Support high RPM motors, can be matched with most of the motors in the RC market. Use new generation of the MOSFETs to make the ESC low heating and high reliability. Capable of ONESHOT42/ ONESHOT125O/MULTISHOT feature to work better with your flight controllers. Fast response to throttle. No settings needed, just plug and play. Specifications: Constant Current: 30A Peak Current: 40A(10s) Voltage: 2-4S Software: BLHELI-S BEC: NO Color: black Net Weight: 8.7g Package Information: Package size: 12.5 * 12.5 * 0.5cm / 4.9 * 2.2 * 0.2in Package weight: 21g / 0.7oz Poly bag package Package List: RM7207 1 * ZTW Flash 30A Brushless ESC 1 * Manual Instruction freewing Rc airplane Sunray SR4 800 hd se FMS rc airplane Kerui alarm Freewing UK