OPTO 20A brushless ESC is specially designed to meet the damand of ever popular multi-rotors. With better quality and competitive price， it will be your best choice for multirotors.<br /><img alt="" src="//www.guphotos.com/images/uploads/RM5177.jpg" style="width: 800px; height: 800px;" /><br />Features:<br />Fast throttle response.<br />Based on BLHeli firmware.<br />Extremely low internal resistance.<br />Specially designed for multicopter.<br />Super smooth and accurate throttle linearity.<br />The maximum refresh frequency up to 500Hz throttle signal， compatible with most flight controls.<br />Throttle signal is twisted pair cable， reduce the crosstalk while the signal transfer by the copper wire and flight more stable.<br /><br />Specifications:<br />Voltage: 2-4S LiPo battery<br />Output current: 20A<br />BEC: NO<br />Signal frequency: 20-499Hz<br />Firmware: BLHeli firmware<br />Size: 41 * 12 * 5mm (without wire)<br />Weight: 8g/pcs<br /><br />Package Information:<br />Package size: 13 * 9 * 1cm / 5.1 * 3.5 * 0.4in <br />Package weight: 45g / 1.6oz<br />Adhesive tape package<br /><br />Package List:<br />4 * 20A Brushless ESC<br><img src="//img.tomtop.com/product/xy/2000/2000/p/gu1/R/7/RM5177/RM5177-1-1ec0-cuYu.jpg" /><br>$$<img src="//img.tomtop.com/product/xy/2000/2000/p/gu1/R/7/RM5177/RM5177-1-1ec0-xnna.jpg" /><br>$$<img src="//img.tomtop.com/product/xy/2000/2000/p/gu1/R/7/RM5177/RM5177-1-1ec0-8dRP.jpg" /><br>$$<img src="//img.tomtop.com/product/xy/2000/2000/p/gu1/R/7/RM5177/RM5177-1-1ec0-nSz1.jpg" /><br>$$<img src="//img.tomtop.com/product/xy/2000/2000/p/gu1/R/7/RM5177/RM5177-1-1ec0-AwRf.jpg" /><br>$$<img src="//img.tomtop.com/product/xy/2000/2000/p/gu1/R/7/RM5177/RM5177-1-1ec0-VWOm.jpg" /><br>$$<img src="//img.tomtop.com/product/xy/2000/2000/p/gu1/R/7/RM5177/RM5177-1-1ec0-WISb.jpg" /><br>$$<img src="//img.tomtop.com/product/xy/2000/2000/p/gu1/R/7/RM5177/RM5177-1-1ec0-0TyW.jpg" /><br>$$<img src="//img.tomtop.com/product/xy/2000/2000/p/gu1/R/7/RM5177/RM5177-1-1ec0-z5b0.jpg" /><br>$$<img src="//img.tomtop.com/product/xy/2000/2000/p/gu1/R/7/RM5177/RM5177-1-1ec0-tfXQ.jpg" /><br>$$<img src="//img.tomtop.com/product/xy/2000/2000/p/gu1/R/7/RM5177/RM5177-1-1ec0-YhNn.jpg" /><br>$$<img src="//img.tomtop.com/product/xy/2000/2000/p/gu1/R/7/RM5177/RM5177-1-1ec0-4a2b.jpg" /><br>