The Flysky FS-i6 FS I6 2.4G 6CH RC Remote Control Transmitter Controller with FS-iA6 Receiver for DIY QAV250 Helicopter Quadcopter works in the frequency range of 2.405 to 2.475GHz.. This radio system uses a high gain? multi-directional antenna that covers the whole frequency band. Paired with a high sensitivity receiver? it ensures a jam-free? long range radio transmission. Meanwhile? each transmitter has a unique ID when pairing with a receiver so as to avoid picking up wrong signals from other transmitters and dramatically enhance its anti-interference capability. Don¨t miss out!                                    Features             Work in the frequency range of 2.405 to 2.475GHz<br> The band has been divided into 142 independent channels<br> Each radio system uses 16 different channels and 160 different types of hopping algorithm<br> High gain? multi-directional antenna covers the whole frequency band<br> Jam-free? long range radio transmission<br> Each transmitter has a unique ID  when pairing with a receiver<br> Dramatically enhanced anti-interference capability<br> High sensitivity? low power consumption<br> The RF modulation uses intermittent signal to reduce energy cost<br> AFHDS2A system with identification switches automatically between single-way and two-way communication modes<br> AFHDS2A system also has built-in multiple channel coding and error correction<br> Slim body and ergonomic design for easy handling <br>                                                            Specifications             Brand     FlySky    <br> Model     FS-i6    <br> Channel     6CH    <br> Frequency     2.4G    <br> Model Type     Fixed Wing / Helicopter / Glider    <br> Channel Resolution     1024 Steps    <br> Low Voltage Warning     Less than 4.2V    <br> ANT Length     26 x 2mm (Dual Antenna)    <br> Battery     6V 1.5AA x 4 (Not Included)    <br> Certification     CE? FCC    <br> Mode     Mode 1 Right Hand    <br> Color     Black    <br> Dimensions     (7.09 x 7.09 x 3.15)" / (18 x 20 x 8)cm (L x W x H)    <br> Weight     10.58oz / 300g   FlySky FS-iA6 Receiver    <br> Channel     6CH    <br> Model Type     Fixed Wing / Helicopter / Glider    <br> RF Receiver Sensitivity     -105dBm    <br> Modulation     GFSK    <br> System Type     AFHDS 2A/AFHDS    <br> RF Power     Less than 20dBm    <br> RF Range     2.405-2.475GHz    <br> Bandwidth     500KHz    <br> Channel Resolution     1024 Steps    <br> Bind Port     Yes    <br> Power Port     Yes (VCC)    <br> Power     4-6.5V DC    <br> Antenna Length     26mm    <br> Certification     CE? FCC    <br> Dimensions     (1.57 x 0.83 x 0.28)" / (4.0 x 2.1 x 0.7)cm (L x W x H)    <br> Weight     0.23oz / 6.4g     <br>                                                             Package Includes            1 x FS-i6 Transmitter<br>1 x FS-iA6 Receiver<br>1 x USB Cable<br>1 x Code Matching Cable<br>1 x User Manual (CD)<br>