★★★★★ MAP $12.99 | MSRP $18.00 HOBBYWING ESCReliable High Efficiency brushless system Special core program for multi-rotor controllers greatly improves throttle response. Specially optimized software for excellent compatibility with disc-type motors. All settings except the "Timing" are preset, making usage simple, highly intelligent and adaptive. The twisted-pair design of the throttle signal cable effectively reduces the crosstalk produced in signal transmission and makes flight more stable. Compatible with various flight-control systems and supports a signal frequency of up to 621Hz (Note: all throttle signals over 500Hz are non-standard signals) . Special drive chip has much better MOSFET driving effect than common driving circuit consisted of discrete components. MOSFET with extra-low resistance brings high performance and great current endurance. Model / SKU XRotor-20A COB/ 30901005 Cont./Peak Current 20A /30A Multicopter Applicable 330/450 Class Quadcopter Input / 3-4S Lipo Bullet connector size 3.5mm BEC Type / BEC Output NO Programming item Timing (High/Intermediate), Size / Weight 52.4 x 21.5 x 6.75mm (main body) / 11.74mm (capacitor dia.)14g (0.49oz) 30901020002 Official Warranty Available through HobbywingDirect.com & FS authorized dealer network in North AmericaFor more information: http://www.hobbywingDirect.com/pages/authorized-dealer Optional devices Manual Download or Online troubleshooting