The most significant feature of the Original Hobbywing SkyWalker 40A Brushless ESC Speed Controller with BEC is its safety arming. No matter what position the throttle stick is at￡? the motor will not spin even if the battery is connected. Plus￡? it offers full protections￡? including low voltage cutoff protection￡? overheat protection￡? and throttle signal loss protection. Throttle range can be configured to provide best throttle linearity. And it is fully compatible with all the transmitters on the market. Isn?ˉt it the right one you want? Click and order now!                                    Features             Safety arming feature: no matter what position the throttle stick is at￡? the motor will not spin even if the battery is connected<br> Offer full protections￡? including low voltage cutoff protection￡? overheat protection￡? and throttle signal loss protection<br> Throttle calibration: throttle range can be configured to provide best throttle linearity<br> Selectable program setting<br> Fully compatible with all market available transmitters   <br>                                                            Specifications             Brand     Hobbywing    <br> Constant Current     40A    <br> BEC Mode     Linear Mode    <br> BEC Output     5V / 3A    <br> Input Voltage     2-3S Lipo￡? 5-9 Cells NiMH    <br> Maximum Speed     210000RPM (2-Pole Motor)￡? 70000RPM (6-Pole Motor)￡? 35000RPM (12-Pole Motor)    <br> Suitable for     400/450 Helicopter 3D￡? and 32-Level Fixed Wings    <br> Dimensions     (3.03 x 1.38 x 0.55)" / (7.7 x 3.5 x 1.4)cm (L x W x H)    <br> Weight     2.22oz / 63g       <br>                                                             Package Includes            1 x 40A Brushless ESC with BEC<br>