?40A brushless ESC electric speed controller with 3A BEC for 500 550 DJI F450 quadcopter.<br> <br> Features:<br> Using MCU processor， the user can set against their demand function.<br> Speed smooth feel， good linear speed regulation.<br> Support unlimited high speed and constant speed function brushless motor.<br> Startup mode can be set up， the throttle response speed.<br> Built-in BEC， load power is big， small power consumption with servo.<br> Multiple protection， overvoltage and overheating， loss of gas.<br> Compatible with all remote control ettings and support programming card set.<br> <br> Specifications:<br> Constant Current: 40A<br> Burst Current: 50A<br> Battery: 2-4S Lipoly<br> BEC: 5V / 3A<br> ESC Size: 7 * 2.5 * 1.2cm / pcs<br> ESC Weight: 48g / pcs<br> <br> Package information:<br> Package Size: 20 * 12 * 4cm / 7.8 * 4.8 * 1.6in<br> Package Weight: 192g / 6.8oz<br> Polybag package<br> <br> Package list:<br> 4 * 40A(2-4S) Brushless ESC<br>  <br>  <br>  <br>  <br>  <br>  <br>  <br>