This is a set of BLHeli Mini 20A ESC 2-4S Brushless Speed Controller for QAV250 300 330<br><br><br>Features:<br>100% brand new and high quality.<br>BLHeli Mini 20A ESC 2-4S Brushless Speed Controller for Mini Multirotor Blue.<br><br>Specifications:<br>Voltage: 6-16.8V (2-4S LiPo)<br>Output current: 20A<br>BEC: No<br>Signal frequency: 20-499Hz<br>Output PWM frequency: 18KHz<br>Firmware: BLHeli firmware version 14.1<br>Weight: 9g (with wires)<br>Size: 47 * 14 * 8mm (without wires)<br>Color: Blue<br><br>Package Information:<br>Package size: 13 * 9 * 2.5cm / 5.1 * 3.6 * 1in<br>Package weight: 47g / 1.65oz<br>Adhesive tape package<br><br>Package List:<br>4 * BLHeli Mini 20A ESC