?The Radiolink AT9 2.4GHz 9 Channel Transmitter Radio &amp; Receiver for RC Hobby is compatible with most multirotors・ including all 120-degree and 90-degree swashplate helicopters・ all fixed wings and gliders・ and more. It features 3ms quick response and strong anti-interference capability so you can rest assured to count on it. Meanwhile・ it adopts advanced data telemetry technology to monitor signal strength・ receiver voltage・ temperature・ motor RPM・ GPS・ etc. Plus・ it is equipped with vibration alarm to protect your important investment. Don¨t hesitate to get one!                                    Features             Compatible with most multirotors<br> 3ms quick response・ strong anti-interference capability<br> QPSK modulation mode<br> Long transmission distance・ 900m on the ground and 1.5km in the air<br> Adopt advanced data telemetry technology to monitor signal strength・ receiver voltage・ temperature・ motor RPM・ GPS・ etc<br> Equipped with vibration alarm to protect your important investment<br> Offer easy-to-use navigation menu in Chinese and English<br> Support R9D・ compatible with FUTABA S-BUS<br> Support USB update<br> Mini sized receiver saves mounting space<br> Programmable mix control・ channel 5 to 9 are customizable<br> Humanized switch design for maximum comfort<br> Support multiple aerial control mode and PTZ control <br>                                                            Specifications             Frequency     2.4GHz ISM Band (2400-2485MHz)    <br> Modulation Mode     QPSK    <br> Channel Bandwidth     5.0MHz    <br> Adjacent Channel Rejection     38dBm    <br> Transmitter Power                             Package Includes            1 x Radiolink AT9 9CH Transmitter<br>1 x Radiolink AT9 9CH Receiver<br>